/*  Prototype JavaScript framework, version 1.6.0.3
 *  (c) 2005-2008 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

var Prototype = {
  Version: '1.6.0.3',

  Browser: {
    IE:     !!(window.attachEvent &&
      navigator.userAgent.indexOf('Opera') === -1),
    Opera:  navigator.userAgent.indexOf('Opera') > -1,
    WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
    Gecko:  navigator.userAgent.indexOf('Gecko') > -1 &&
      navigator.userAgent.indexOf('KHTML') === -1,
    MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
  },

  BrowserFeatures: {
    XPath: !!document.evaluate,
    SelectorsAPI: !!document.querySelector,
    ElementExtensions: !!window.HTMLElement,
    SpecificElementExtensions:
      document.createElement('div')['__proto__'] &&
      document.createElement('div')['__proto__'] !==
        document.createElement('form')['__proto__']
  },

  ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
  JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

  emptyFunction: function() { },
  K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
  Prototype.BrowserFeatures.SpecificElementExtensions = false;


/* Based on Alex Arnell's inheritance implementation. */
var Class = {
  create: function() {
    var parent = null, properties = $A(arguments);
    if (Object.isFunction(properties[0]))
      parent = properties.shift();

    function klass() {
      this.initialize.apply(this, arguments);
    }

    Object.extend(klass, Class.Methods);
    klass.superclass = parent;
    klass.subclasses = [];

    if (parent) {
      var subclass = function() { };
      subclass.prototype = parent.prototype;
      klass.prototype = new subclass;
      parent.subclasses.push(klass);
    }

    for (var i = 0; i < properties.length; i++)
      klass.addMethods(properties[i]);

    if (!klass.prototype.initialize)
      klass.prototype.initialize = Prototype.emptyFunction;

    klass.prototype.constructor = klass;

    return klass;
  }
};

Class.Methods = {
  addMethods: function(source) {
    var ancestor   = this.superclass && this.superclass.prototype;
    var properties = Object.keys(source);

    if (!Object.keys({ toString: true }).length)
      properties.push("toString", "valueOf");

    for (var i = 0, length = properties.length; i < length; i++) {
      var property = properties[i], value = source[property];
      if (ancestor && Object.isFunction(value) &&
          value.argumentNames().first() == "$super") {
        var method = value;
        value = (function(m) {
          return function() { return ancestor[m].apply(this, arguments) };
        })(property).wrap(method);

        value.valueOf = method.valueOf.bind(method);
        value.toString = method.toString.bind(method);
      }
      this.prototype[property] = value;
    }

    return this;
  }
};

var Abstract = { };

Object.extend = function(destination, source) {
  for (var property in source)
    destination[property] = source[property];
  return destination;
};

Object.extend(Object, {
  inspect: function(object) {
    try {
      if (Object.isUndefined(object)) return 'undefined';
      if (object === null) return 'null';
      return object.inspect ? object.inspect() : String(object);
    } catch (e) {
      if (e instanceof RangeError) return '...';
      throw e;
    }
  },

  toJSON: function(object) {
    var type = typeof object;
    switch (type) {
      case 'undefined':
      case 'function':
      case 'unknown': return;
      case 'boolean': return object.toString();
    }

    if (object === null) return 'null';
    if (object.toJSON) return object.toJSON();
    if (Object.isElement(object)) return;

    var results = [];
    for (var property in object) {
      var value = Object.toJSON(object[property]);
      if (!Object.isUndefined(value))
        results.push(property.toJSON() + ': ' + value);
    }

    return '{' + results.join(', ') + '}';
  },

  toQueryString: function(object) {
    return $H(object).toQueryString();
  },

  toHTML: function(object) {
    return object && object.toHTML ? object.toHTML() : String.interpret(object);
  },

  keys: function(object) {
    var keys = [];
    for (var property in object)
      keys.push(property);
    return keys;
  },

  values: function(object) {
    var values = [];
    for (var property in object)
      values.push(object[property]);
    return values;
  },

  clone: function(object) {
    return Object.extend({ }, object);
  },

  isElement: function(object) {
    return !!(object && object.nodeType == 1);
  },

  isArray: function(object) {
    return object != null && typeof object == "object" &&
      'splice' in object && 'join' in object;
  },

  isHash: function(object) {
    return object instanceof Hash;
  },

  isFunction: function(object) {
    return typeof object == "function";
  },

  isString: function(object) {
    return typeof object == "string";
  },

  isNumber: function(object) {
    return typeof object == "number";
  },

  isUndefined: function(object) {
    return typeof object == "undefined";
  }
});

Object.extend(Function.prototype, {
  argumentNames: function() {
    var names = this.toString().match(/^[\s\(]*function[^(]*\(([^\)]*)\)/)[1]
      .replace(/\s+/g, '').split(',');
    return names.length == 1 && !names[0] ? [] : names;
  },

  bind: function() {
    if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
    var __method = this, args = $A(arguments), object = args.shift();
    return function() {
      return __method.apply(object, args.concat($A(arguments)));
    }
  },

  bindAsEventListener: function() {
    var __method = this, args = $A(arguments), object = args.shift();
    return function(event) {
      return __method.apply(object, [event || window.event].concat(args));
    }
  },

  curry: function() {
    if (!arguments.length) return this;
    var __method = this, args = $A(arguments);
    return function() {
      return __method.apply(this, args.concat($A(arguments)));
    }
  },

  delay: function() {
    var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
    return window.setTimeout(function() {
      return __method.apply(__method, args);
    }, timeout);
  },

  defer: function() {
    var args = [0.01].concat($A(arguments));
    return this.delay.apply(this, args);
  },

  wrap: function(wrapper) {
    var __method = this;
    return function() {
      return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
    }
  },

  methodize: function() {
    if (this._methodized) return this._methodized;
    var __method = this;
    return this._methodized = function() {
      return __method.apply(null, [this].concat($A(arguments)));
    };
  }
});

Date.prototype.toJSON = function() {
  return '"' + this.getUTCFullYear() + '-' +
    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
    this.getUTCDate().toPaddedString(2) + 'T' +
    this.getUTCHours().toPaddedString(2) + ':' +
    this.getUTCMinutes().toPaddedString(2) + ':' +
    this.getUTCSeconds().toPaddedString(2) + 'Z"';
};

var Try = {
  these: function() {
    var returnValue;

    for (var i = 0, length = arguments.length; i < length; i++) {
      var lambda = arguments[i];
      try {
        returnValue = lambda();
        break;
      } catch (e) { }
    }

    return returnValue;
  }
};

RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
  return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
  initialize: function(callback, frequency) {
    this.callback = callback;
    this.frequency = frequency;
    this.currentlyExecuting = false;

    this.registerCallback();
  },

  registerCallback: function() {
    this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
  },

  execute: function() {
    this.callback(this);
  },

  stop: function() {
    if (!this.timer) return;
    clearInterval(this.timer);
    this.timer = null;
  },

  onTimerEvent: function() {
    if (!this.currentlyExecuting) {
      try {
        this.currentlyExecuting = true;
        this.execute();
      } finally {
        this.currentlyExecuting = false;
      }
    }
  }
});
Object.extend(String, {
  interpret: function(value) {
    return value == null ? '' : String(value);
  },
  specialChar: {
    '\b': '\\b',
    '\t': '\\t',
    '\n': '\\n',
    '\f': '\\f',
    '\r': '\\r',
    '\\': '\\\\'
  }
});

Object.extend(String.prototype, {
  gsub: function(pattern, replacement) {
    var result = '', source = this, match;
    replacement = arguments.callee.prepareReplacement(replacement);

    while (source.length > 0) {
      if (match = source.match(pattern)) {
        result += source.slice(0, match.index);
        result += String.interpret(replacement(match));
        source  = source.slice(match.index + match[0].length);
      } else {
        result += source, source = '';
      }
    }
    return result;
  },

  sub: function(pattern, replacement, count) {
    replacement = this.gsub.prepareReplacement(replacement);
    count = Object.isUndefined(count) ? 1 : count;

    return this.gsub(pattern, function(match) {
      if (--count < 0) return match[0];
      return replacement(match);
    });
  },

  scan: function(pattern, iterator) {
    this.gsub(pattern, iterator);
    return String(this);
  },

  truncate: function(length, truncation) {
    length = length || 30;
    truncation = Object.isUndefined(truncation) ? '...' : truncation;
    return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : String(this);
  },

  strip: function() {
    return this.replace(/^\s+/, '').replace(/\s+$/, '');
  },

  stripTags: function() {
    return this.replace(/<\/?[^>]+>/gi, '');
  },

  stripScripts: function() {
    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
  },

  extractScripts: function() {
    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
    return (this.match(matchAll) || []).map(function(scriptTag) {
      return (scriptTag.match(matchOne) || ['', ''])[1];
    });
  },

  evalScripts: function() {
    return this.extractScripts().map(function(script) { return eval(script) });
  },

  escapeHTML: function() {
    var self = arguments.callee;
    self.text.data = this;
    return self.div.innerHTML;
  },

  unescapeHTML: function() {
    var div = new Element('div');
    div.innerHTML = this.stripTags();
    return div.childNodes[0] ? (div.childNodes.length > 1 ?
      $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
      div.childNodes[0].nodeValue) : '';
  },

  toQueryParams: function(separator) {
    var match = this.strip().match(/([^?#]*)(#.*)?$/);
    if (!match) return { };

    return match[1].split(separator || '&').inject({ }, function(hash, pair) {
      if ((pair = pair.split('='))[0]) {
        var key = decodeURIComponent(pair.shift());
        var value = pair.length > 1 ? pair.join('=') : pair[0];
        if (value != undefined) value = decodeURIComponent(value);

        if (key in hash) {
          if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
          hash[key].push(value);
        }
        else hash[key] = value;
      }
      return hash;
    });
  },

  toArray: function() {
    return this.split('');
  },

  succ: function() {
    return this.slice(0, this.length - 1) +
      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
  },

  times: function(count) {
    return count < 1 ? '' : new Array(count + 1).join(this);
  },

  camelize: function() {
    var parts = this.split('-'), len = parts.length;
    if (len == 1) return parts[0];

    var camelized = this.charAt(0) == '-'
      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
      : parts[0];

    for (var i = 1; i < len; i++)
      camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

    return camelized;
  },

  capitalize: function() {
    return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
  },

  underscore: function() {
    return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
  },

  dasherize: function() {
    return this.gsub(/_/,'-');
  },

  inspect: function(useDoubleQuotes) {
    var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
      var character = String.specialChar[match[0]];
      return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
    });
    if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
    return "'" + escapedString.replace(/'/g, '\\\'') + "'";
  },

  toJSON: function() {
    return this.inspect(true);
  },

  unfilterJSON: function(filter) {
    return this.sub(filter || Prototype.JSONFilter, '#{1}');
  },

  isJSON: function() {
    var str = this;
    if (str.blank()) return false;
    str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
    return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
  },

  evalJSON: function(sanitize) {
    var json = this.unfilterJSON();
    try {
      if (!sanitize || json.isJSON()) return eval('(' + json + ')');
    } catch (e) { }
    throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
  },

  include: function(pattern) {
    return this.indexOf(pattern) > -1;
  },

  startsWith: function(pattern) {
    return this.indexOf(pattern) === 0;
  },

  endsWith: function(pattern) {
    var d = this.length - pattern.length;
    return d >= 0 && this.lastIndexOf(pattern) === d;
  },

  empty: function() {
    return this == '';
  },

  blank: function() {
    return /^\s*$/.test(this);
  },

  interpolate: function(object, pattern) {
    return new Template(this, pattern).evaluate(object);
  }
});

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
  escapeHTML: function() {
    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
  },
  unescapeHTML: function() {
    return this.stripTags().replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
  }
});

String.prototype.gsub.prepareReplacement = function(replacement) {
  if (Object.isFunction(replacement)) return replacement;
  var template = new Template(replacement);
  return function(match) { return template.evaluate(match) };
};

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
  div:  document.createElement('div'),
  text: document.createTextNode('')
});

String.prototype.escapeHTML.div.appendChild(String.prototype.escapeHTML.text);

var Template = Class.create({
  initialize: function(template, pattern) {
    this.template = template.toString();
    this.pattern = pattern || Template.Pattern;
  },

  evaluate: function(object) {
    if (Object.isFunction(object.toTemplateReplacements))
      object = object.toTemplateReplacements();

    return this.template.gsub(this.pattern, function(match) {
      if (object == null) return '';

      var before = match[1] || '';
      if (before == '\\') return match[2];

      var ctx = object, expr = match[3];
      var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
      match = pattern.exec(expr);
      if (match == null) return before;

      while (match != null) {
        var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
        ctx = ctx[comp];
        if (null == ctx || '' == match[3]) break;
        expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
        match = pattern.exec(expr);
      }

      return before + String.interpret(ctx);
    });
  }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = { };

var Enumerable = {
  each: function(iterator, context) {
    var index = 0;
    try {
      this._each(function(value) {
        iterator.call(context, value, index++);
      });
    } catch (e) {
      if (e != $break) throw e;
    }
    return this;
  },

  eachSlice: function(number, iterator, context) {
    var index = -number, slices = [], array = this.toArray();
    if (number < 1) return array;
    while ((index += number) < array.length)
      slices.push(array.slice(index, index+number));
    return slices.collect(iterator, context);
  },

  all: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result = true;
    this.each(function(value, index) {
      result = result && !!iterator.call(context, value, index);
      if (!result) throw $break;
    });
    return result;
  },

  any: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result = false;
    this.each(function(value, index) {
      if (result = !!iterator.call(context, value, index))
        throw $break;
    });
    return result;
  },

  collect: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var results = [];
    this.each(function(value, index) {
      results.push(iterator.call(context, value, index));
    });
    return results;
  },

  detect: function(iterator, context) {
    var result;
    this.each(function(value, index) {
      if (iterator.call(context, value, index)) {
        result = value;
        throw $break;
      }
    });
    return result;
  },

  findAll: function(iterator, context) {
    var results = [];
    this.each(function(value, index) {
      if (iterator.call(context, value, index))
        results.push(value);
    });
    return results;
  },

  grep: function(filter, iterator, context) {
    iterator = iterator || Prototype.K;
    var results = [];

    if (Object.isString(filter))
      filter = new RegExp(filter);

    this.each(function(value, index) {
      if (filter.match(value))
        results.push(iterator.call(context, value, index));
    });
    return results;
  },

  include: function(object) {
    if (Object.isFunction(this.indexOf))
      if (this.indexOf(object) != -1) return true;

    var found = false;
    this.each(function(value) {
      if (value == object) {
        found = true;
        throw $break;
      }
    });
    return found;
  },

  inGroupsOf: function(number, fillWith) {
    fillWith = Object.isUndefined(fillWith) ? null : fillWith;
    return this.eachSlice(number, function(slice) {
      while(slice.length < number) slice.push(fillWith);
      return slice;
    });
  },

  inject: function(memo, iterator, context) {
    this.each(function(value, index) {
      memo = iterator.call(context, memo, value, index);
    });
    return memo;
  },

  invoke: function(method) {
    var args = $A(arguments).slice(1);
    return this.map(function(value) {
      return value[method].apply(value, args);
    });
  },

  max: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator.call(context, value, index);
      if (result == null || value >= result)
        result = value;
    });
    return result;
  },

  min: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator.call(context, value, index);
      if (result == null || value < result)
        result = value;
    });
    return result;
  },

  partition: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var trues = [], falses = [];
    this.each(function(value, index) {
      (iterator.call(context, value, index) ?
        trues : falses).push(value);
    });
    return [trues, falses];
  },

  pluck: function(property) {
    var results = [];
    this.each(function(value) {
      results.push(value[property]);
    });
    return results;
  },

  reject: function(iterator, context) {
    var results = [];
    this.each(function(value, index) {
      if (!iterator.call(context, value, index))
        results.push(value);
    });
    return results;
  },

  sortBy: function(iterator, context) {
    return this.map(function(value, index) {
      return {
        value: value,
        criteria: iterator.call(context, value, index)
      };
    }).sort(function(left, right) {
      var a = left.criteria, b = right.criteria;
      return a < b ? -1 : a > b ? 1 : 0;
    }).pluck('value');
  },

  toArray: function() {
    return this.map();
  },

  zip: function() {
    var iterator = Prototype.K, args = $A(arguments);
    if (Object.isFunction(args.last()))
      iterator = args.pop();

    var collections = [this].concat(args).map($A);
    return this.map(function(value, index) {
      return iterator(collections.pluck(index));
    });
  },

  size: function() {
    return this.toArray().length;
  },

  inspect: function() {
    return '#<Enumerable:' + this.toArray().inspect() + '>';
  }
};

Object.extend(Enumerable, {
  map:     Enumerable.collect,
  find:    Enumerable.detect,
  select:  Enumerable.findAll,
  filter:  Enumerable.findAll,
  member:  Enumerable.include,
  entries: Enumerable.toArray,
  every:   Enumerable.all,
  some:    Enumerable.any
});
function $A(iterable) {
  if (!iterable) return [];
  if (iterable.toArray) return iterable.toArray();
  var length = iterable.length || 0, results = new Array(length);
  while (length--) results[length] = iterable[length];
  return results;
}

if (Prototype.Browser.WebKit) {
  $A = function(iterable) {
    if (!iterable) return [];
    // In Safari, only use the `toArray` method if it's not a NodeList.
    // A NodeList is a function, has an function `item` property, and a numeric
    // `length` property. Adapted from Google Doctype.
    if (!(typeof iterable === 'function' && typeof iterable.length ===
        'number' && typeof iterable.item === 'function') && iterable.toArray)
      return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
  };
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
  _each: function(iterator) {
    for (var i = 0, length = this.length; i < length; i++)
      iterator(this[i]);
  },

  clear: function() {
    this.length = 0;
    return this;
  },

  first: function() {
    return this[0];
  },

  last: function() {
    return this[this.length - 1];
  },

  compact: function() {
    return this.select(function(value) {
      return value != null;
    });
  },

  flatten: function() {
    return this.inject([], function(array, value) {
      return array.concat(Object.isArray(value) ?
        value.flatten() : [value]);
    });
  },

  without: function() {
    var values = $A(arguments);
    return this.select(function(value) {
      return !values.include(value);
    });
  },

  reverse: function(inline) {
    return (inline !== false ? this : this.toArray())._reverse();
  },

  reduce: function() {
    return this.length > 1 ? this : this[0];
  },

  uniq: function(sorted) {
    return this.inject([], function(array, value, index) {
      if (0 == index || (sorted ? array.last() != value : !array.include(value)))
        array.push(value);
      return array;
    });
  },

  intersect: function(array) {
    return this.uniq().findAll(function(item) {
      return array.detect(function(value) { return item === value });
    });
  },

  clone: function() {
    return [].concat(this);
  },

  size: function() {
    return this.length;
  },

  inspect: function() {
    return '[' + this.map(Object.inspect).join(', ') + ']';
  },

  toJSON: function() {
    var results = [];
    this.each(function(object) {
      var value = Object.toJSON(object);
      if (!Object.isUndefined(value)) results.push(value);
    });
    return '[' + results.join(', ') + ']';
  }
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
  Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
  i || (i = 0);
  var length = this.length;
  if (i < 0) i = length + i;
  for (; i < length; i++)
    if (this[i] === item) return i;
  return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
  i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
  var n = this.slice(0, i).reverse().indexOf(item);
  return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

function $w(string) {
  if (!Object.isString(string)) return [];
  string = string.strip();
  return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera){
  Array.prototype.concat = function() {
    var array = [];
    for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
    for (var i = 0, length = arguments.length; i < length; i++) {
      if (Object.isArray(arguments[i])) {
        for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
          array.push(arguments[i][j]);
      } else {
        array.push(arguments[i]);
      }
    }
    return array;
  };
}
Object.extend(Number.prototype, {
  toColorPart: function() {
    return this.toPaddedString(2, 16);
  },

  succ: function() {
    return this + 1;
  },

  times: function(iterator, context) {
    $R(0, this, true).each(iterator, context);
    return this;
  },

  toPaddedString: function(length, radix) {
    var string = this.toString(radix || 10);
    return '0'.times(length - string.length) + string;
  },

  toJSON: function() {
    return isFinite(this) ? this.toString() : 'null';
  }
});

$w('abs round ceil floor').each(function(method){
  Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
  return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {

  function toQueryPair(key, value) {
    if (Object.isUndefined(value)) return key;
    return key + '=' + encodeURIComponent(String.interpret(value));
  }

  return {
    initialize: function(object) {
      this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
    },

    _each: function(iterator) {
      for (var key in this._object) {
        var value = this._object[key], pair = [key, value];
        pair.key = key;
        pair.value = value;
        iterator(pair);
      }
    },

    set: function(key, value) {
      return this._object[key] = value;
    },

    get: function(key) {
      // simulating poorly supported hasOwnProperty
      if (this._object[key] !== Object.prototype[key])
        return this._object[key];
    },

    unset: function(key) {
      var value = this._object[key];
      delete this._object[key];
      return value;
    },

    toObject: function() {
      return Object.clone(this._object);
    },

    keys: function() {
      return this.pluck('key');
    },

    values: function() {
      return this.pluck('value');
    },

    index: function(value) {
      var match = this.detect(function(pair) {
        return pair.value === value;
      });
      return match && match.key;
    },

    merge: function(object) {
      return this.clone().update(object);
    },

    update: function(object) {
      return new Hash(object).inject(this, function(result, pair) {
        result.set(pair.key, pair.value);
        return result;
      });
    },

    toQueryString: function() {
      return this.inject([], function(results, pair) {
        var key = encodeURIComponent(pair.key), values = pair.value;

        if (values && typeof values == 'object') {
          if (Object.isArray(values))
            return results.concat(values.map(toQueryPair.curry(key)));
        } else results.push(toQueryPair(key, values));
        return results;
      }).join('&');
    },

    inspect: function() {
      return '#<Hash:{' + this.map(function(pair) {
        return pair.map(Object.inspect).join(': ');
      }).join(', ') + '}>';
    },

    toJSON: function() {
      return Object.toJSON(this.toObject());
    },

    clone: function() {
      return new Hash(this);
    }
  }
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
  initialize: function(start, end, exclusive) {
    this.start = start;
    this.end = end;
    this.exclusive = exclusive;
  },

  _each: function(iterator) {
    var value = this.start;
    while (this.include(value)) {
      iterator(value);
      value = value.succ();
    }
  },

  include: function(value) {
    if (value < this.start)
      return false;
    if (this.exclusive)
      return value < this.end;
    return value <= this.end;
  }
});

var $R = function(start, end, exclusive) {
  return new ObjectRange(start, end, exclusive);
};

var Ajax = {
  getTransport: function() {
    return Try.these(
      function() {return new XMLHttpRequest()},
      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
    ) || false;
  },

  activeRequestCount: 0
};

Ajax.Responders = {
  responders: [],

  _each: function(iterator) {
    this.responders._each(iterator);
  },

  register: function(responder) {
    if (!this.include(responder))
      this.responders.push(responder);
  },

  unregister: function(responder) {
    this.responders = this.responders.without(responder);
  },

  dispatch: function(callback, request, transport, json) {
    this.each(function(responder) {
      if (Object.isFunction(responder[callback])) {
        try {
          responder[callback].apply(responder, [request, transport, json]);
        } catch (e) { }
      }
    });
  }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
  onCreate:   function() { Ajax.activeRequestCount++ },
  onComplete: function() { Ajax.activeRequestCount-- }
});

Ajax.Base = Class.create({
  initialize: function(options) {
    this.options = {
      method:       'post',
      asynchronous: true,
      contentType:  'application/x-www-form-urlencoded',
      encoding:     'UTF-8',
      parameters:   '',
      evalJSON:     true,
      evalJS:       true
    };
    Object.extend(this.options, options || { });

    this.options.method = this.options.method.toLowerCase();

    if (Object.isString(this.options.parameters))
      this.options.parameters = this.options.parameters.toQueryParams();
    else if (Object.isHash(this.options.parameters))
      this.options.parameters = this.options.parameters.toObject();
  }
});

Ajax.Request = Class.create(Ajax.Base, {
  _complete: false,

  initialize: function($super, url, options) {
    $super(options);
    this.transport = Ajax.getTransport();
    this.request(url);
  },

  request: function(url) {
    this.url = url;
    this.method = this.options.method;
    var params = Object.clone(this.options.parameters);

    if (!['get', 'post'].include(this.method)) {
      // simulate other verbs over post
      params['_method'] = this.method;
      this.method = 'post';
    }

    this.parameters = params;

    if (params = Object.toQueryString(params)) {
      // when GET, append parameters to URL
      if (this.method == 'get')
        this.url += (this.url.include('?') ? '&' : '?') + params;
      else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
        params += '&_=';
    }

    try {
      var response = new Ajax.Response(this);
      if (this.options.onCreate) this.options.onCreate(response);
      Ajax.Responders.dispatch('onCreate', this, response);

      this.transport.open(this.method.toUpperCase(), this.url,
        this.options.asynchronous);

      if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

      this.transport.onreadystatechange = this.onStateChange.bind(this);
      this.setRequestHeaders();

      this.body = this.method == 'post' ? (this.options.postBody || params) : null;
      this.transport.send(this.body);

      /* Force Firefox to handle ready state 4 for synchronous requests */
      if (!this.options.asynchronous && this.transport.overrideMimeType)
        this.onStateChange();

    }
    catch (e) {
      this.dispatchException(e);
    }
  },

  onStateChange: function() {
    var readyState = this.transport.readyState;
    if (readyState > 1 && !((readyState == 4) && this._complete))
      this.respondToReadyState(this.transport.readyState);
  },

  setRequestHeaders: function() {
    var headers = {
      'X-Requested-With': 'XMLHttpRequest',
      'X-Prototype-Version': Prototype.Version,
      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
    };

    if (this.method == 'post') {
      headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');

      /* Force "Connection: close" for older Mozilla browsers to work
       * around a bug where XMLHttpRequest sends an incorrect
       * Content-length header. See Mozilla Bugzilla #246651.
       */
      if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
            headers['Connection'] = 'close';
    }

    // user-defined headers
    if (typeof this.options.requestHeaders == 'object') {
      var extras = this.options.requestHeaders;

      if (Object.isFunction(extras.push))
        for (var i = 0, length = extras.length; i < length; i += 2)
          headers[extras[i]] = extras[i+1];
      else
        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
    }

    for (var name in headers)
      this.transport.setRequestHeader(name, headers[name]);
  },

  success: function() {
    var status = this.getStatus();
    return !status || (status >= 200 && status < 300);
  },

  getStatus: function() {
    try {
      return this.transport.status || 0;
    } catch (e) { return 0 }
  },

  respondToReadyState: function(readyState) {
    var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

    if (state == 'Complete') {
      try {
        this._complete = true;
        (this.options['on' + response.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(response, response.headerJSON);
      } catch (e) {
        this.dispatchException(e);
      }

      var contentType = response.getHeader('Content-type');
      if (this.options.evalJS == 'force'
          || (this.options.evalJS && this.isSameOrigin() && contentType
          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
        this.evalResponse();
    }

    try {
      (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
      Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
    } catch (e) {
      this.dispatchException(e);
    }

    if (state == 'Complete') {
      // avoid memory leak in MSIE: clean up
      this.transport.onreadystatechange = Prototype.emptyFunction;
    }
  },

  isSameOrigin: function() {
    var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
    return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
      protocol: location.protocol,
      domain: document.domain,
      port: location.port ? ':' + location.port : ''
    }));
  },

  getHeader: function(name) {
    try {
      return this.transport.getResponseHeader(name) || null;
    } catch (e) { return null }
  },

  evalResponse: function() {
    try {
      return eval((this.transport.responseText || '').unfilterJSON());
    } catch (e) {
      this.dispatchException(e);
    }
  },

  dispatchException: function(exception) {
    (this.options.onException || Prototype.emptyFunction)(this, exception);
    Ajax.Responders.dispatch('onException', this, exception);
  }
});

Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Response = Class.create({
  initialize: function(request){
    this.request = request;
    var transport  = this.transport  = request.transport,
        readyState = this.readyState = transport.readyState;

    if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
      this.status       = this.getStatus();
      this.statusText   = this.getStatusText();
      this.responseText = String.interpret(transport.responseText);
      this.headerJSON   = this._getHeaderJSON();
    }

    if(readyState == 4) {
      var xml = transport.responseXML;
      this.responseXML  = Object.isUndefined(xml) ? null : xml;
      this.responseJSON = this._getResponseJSON();
    }
  },

  status:      0,
  statusText: '',

  getStatus: Ajax.Request.prototype.getStatus,

  getStatusText: function() {
    try {
      return this.transport.statusText || '';
    } catch (e) { return '' }
  },

  getHeader: Ajax.Request.prototype.getHeader,

  getAllHeaders: function() {
    try {
      return this.getAllResponseHeaders();
    } catch (e) { return null }
  },

  getResponseHeader: function(name) {
    return this.transport.getResponseHeader(name);
  },

  getAllResponseHeaders: function() {
    return this.transport.getAllResponseHeaders();
  },

  _getHeaderJSON: function() {
    var json = this.getHeader('X-JSON');
    if (!json) return null;
    json = decodeURIComponent(escape(json));
    try {
      return json.evalJSON(this.request.options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  },

  _getResponseJSON: function() {
    var options = this.request.options;
    if (!options.evalJSON || (options.evalJSON != 'force' &&
      !(this.getHeader('Content-type') || '').include('application/json')) ||
        this.responseText.blank())
          return null;
    try {
      return this.responseText.evalJSON(options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  }
});

Ajax.Updater = Class.create(Ajax.Request, {
  initialize: function($super, container, url, options) {
    this.container = {
      success: (container.success || container),
      failure: (container.failure || (container.success ? null : container))
    };

    options = Object.clone(options);
    var onComplete = options.onComplete;
    options.onComplete = (function(response, json) {
      this.updateContent(response.responseText);
      if (Object.isFunction(onComplete)) onComplete(response, json);
    }).bind(this);

    $super(url, options);
  },

  updateContent: function(responseText) {
    var receiver = this.container[this.success() ? 'success' : 'failure'],
        options = this.options;

    if (!options.evalScripts) responseText = responseText.stripScripts();

    if (receiver = $(receiver)) {
      if (options.insertion) {
        if (Object.isString(options.insertion)) {
          var insertion = { }; insertion[options.insertion] = responseText;
          receiver.insert(insertion);
        }
        else options.insertion(receiver, responseText);
      }
      else receiver.update(responseText);
    }
  }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
  initialize: function($super, container, url, options) {
    $super(options);
    this.onComplete = this.options.onComplete;

    this.frequency = (this.options.frequency || 2);
    this.decay = (this.options.decay || 1);

    this.updater = { };
    this.container = container;
    this.url = url;

    this.start();
  },

  start: function() {
    this.options.onComplete = this.updateComplete.bind(this);
    this.onTimerEvent();
  },

  stop: function() {
    this.updater.options.onComplete = undefined;
    clearTimeout(this.timer);
    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
  },

  updateComplete: function(response) {
    if (this.options.decay) {
      this.decay = (response.responseText == this.lastText ?
        this.decay * this.options.decay : 1);

      this.lastText = response.responseText;
    }
    this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
  },

  onTimerEvent: function() {
    this.updater = new Ajax.Updater(this.container, this.url, this.options);
  }
});
function $(element) {
  if (arguments.length > 1) {
    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
      elements.push($(arguments[i]));
    return elements;
  }
  if (Object.isString(element))
    element = document.getElementById(element);
  return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
  document._getElementsByXPath = function(expression, parentElement) {
    var results = [];
    var query = document.evaluate(expression, $(parentElement) || document,
      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    for (var i = 0, length = query.snapshotLength; i < length; i++)
      results.push(Element.extend(query.snapshotItem(i)));
    return results;
  };
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = { };

if (!Node.ELEMENT_NODE) {
  // DOM level 2 ECMAScript Language Binding
  Object.extend(Node, {
    ELEMENT_NODE: 1,
    ATTRIBUTE_NODE: 2,
    TEXT_NODE: 3,
    CDATA_SECTION_NODE: 4,
    ENTITY_REFERENCE_NODE: 5,
    ENTITY_NODE: 6,
    PROCESSING_INSTRUCTION_NODE: 7,
    COMMENT_NODE: 8,
    DOCUMENT_NODE: 9,
    DOCUMENT_TYPE_NODE: 10,
    DOCUMENT_FRAGMENT_NODE: 11,
    NOTATION_NODE: 12
  });
}

(function() {
  var element = this.Element;
  this.Element = function(tagName, attributes) {
    attributes = attributes || { };
    tagName = tagName.toLowerCase();
    var cache = Element.cache;
    if (Prototype.Browser.IE && attributes.name) {
      tagName = '<' + tagName + ' name="' + attributes.name + '">';
      delete attributes.name;
      return Element.writeAttribute(document.createElement(tagName), attributes);
    }
    if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
    return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
  };
  Object.extend(this.Element, element || { });
  if (element) this.Element.prototype = element.prototype;
}).call(window);

Element.cache = { };

Element.Methods = {
  visible: function(element) {
    return $(element).style.display != 'none';
  },

  toggle: function(element) {
    element = $(element);
    Element[Element.visible(element) ? 'hide' : 'show'](element);
    return element;
  },

  hide: function(element) {
    element = $(element);
    element.style.display = 'none';
    return element;
  },

  show: function(element) {
    element = $(element);
    element.style.display = '';
    return element;
  },

  remove: function(element) {
    element = $(element);
    element.parentNode.removeChild(element);
    return element;
  },

  update: function(element, content) {
    element = $(element);
    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) return element.update().insert(content);
    content = Object.toHTML(content);
    element.innerHTML = content.stripScripts();
    content.evalScripts.bind(content).defer();
    return element;
  },

  replace: function(element, content) {
    element = $(element);
    if (content && content.toElement) content = content.toElement();
    else if (!Object.isElement(content)) {
      content = Object.toHTML(content);
      var range = element.ownerDocument.createRange();
      range.selectNode(element);
      content.evalScripts.bind(content).defer();
      content = range.createContextualFragment(content.stripScripts());
    }
    element.parentNode.replaceChild(content, element);
    return element;
  },

  insert: function(element, insertions) {
    element = $(element);

    if (Object.isString(insertions) || Object.isNumber(insertions) ||
        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
          insertions = {bottom:insertions};

    var content, insert, tagName, childNodes;

    for (var position in insertions) {
      content  = insertions[position];
      position = position.toLowerCase();
      insert = Element._insertionTranslations[position];

      if (content && content.toElement) content = content.toElement();
      if (Object.isElement(content)) {
        insert(element, content);
        continue;
      }

      content = Object.toHTML(content);

      tagName = ((position == 'before' || position == 'after')
        ? element.parentNode : element).tagName.toUpperCase();

      childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

      if (position == 'top' || position == 'after') childNodes.reverse();
      childNodes.each(insert.curry(element));

      content.evalScripts.bind(content).defer();
    }

    return element;
  },

  wrap: function(element, wrapper, attributes) {
    element = $(element);
    if (Object.isElement(wrapper))
      $(wrapper).writeAttribute(attributes || { });
    else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
    else wrapper = new Element('div', wrapper);
    if (element.parentNode)
      element.parentNode.replaceChild(wrapper, element);
    wrapper.appendChild(element);
    return wrapper;
  },

  inspect: function(element) {
    element = $(element);
    var result = '<' + element.tagName.toLowerCase();
    $H({'id': 'id', 'className': 'class'}).each(function(pair) {
      var property = pair.first(), attribute = pair.last();
      var value = (element[property] || '').toString();
      if (value) result += ' ' + attribute + '=' + value.inspect(true);
    });
    return result + '>';
  },

  recursivelyCollect: function(element, property) {
    element = $(element);
    var elements = [];
    while (element = element[property])
      if (element.nodeType == 1)
        elements.push(Element.extend(element));
    return elements;
  },

  ancestors: function(element) {
    return $(element).recursivelyCollect('parentNode');
  },

  descendants: function(element) {
    return $(element).select("*");
  },

  firstDescendant: function(element) {
    element = $(element).firstChild;
    while (element && element.nodeType != 1) element = element.nextSibling;
    return $(element);
  },

  immediateDescendants: function(element) {
    if (!(element = $(element).firstChild)) return [];
    while (element && element.nodeType != 1) element = element.nextSibling;
    if (element) return [element].concat($(element).nextSiblings());
    return [];
  },

  previousSiblings: function(element) {
    return $(element).recursivelyCollect('previousSibling');
  },

  nextSiblings: function(element) {
    return $(element).recursivelyCollect('nextSibling');
  },

  siblings: function(element) {
    element = $(element);
    return element.previousSiblings().reverse().concat(element.nextSiblings());
  },

  match: function(element, selector) {
    if (Object.isString(selector))
      selector = new Selector(selector);
    return selector.match($(element));
  },

  up: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(element.parentNode);
    var ancestors = element.ancestors();
    return Object.isNumber(expression) ? ancestors[expression] :
      Selector.findElement(ancestors, expression, index);
  },

  down: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return element.firstDescendant();
    return Object.isNumber(expression) ? element.descendants()[expression] :
      Element.select(element, expression)[index || 0];
  },

  previous: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
    var previousSiblings = element.previousSiblings();
    return Object.isNumber(expression) ? previousSiblings[expression] :
      Selector.findElement(previousSiblings, expression, index);
  },

  next: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
    var nextSiblings = element.nextSiblings();
    return Object.isNumber(expression) ? nextSiblings[expression] :
      Selector.findElement(nextSiblings, expression, index);
  },

  select: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element, args);
  },

  adjacent: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element.parentNode, args).without(element);
  },

  identify: function(element) {
    element = $(element);
    var id = element.readAttribute('id'), self = arguments.callee;
    if (id) return id;
    do { id = 'anonymous_element_' + self.counter++ } while ($(id));
    element.writeAttribute('id', id);
    return id;
  },

  readAttribute: function(element, name) {
    element = $(element);
    if (Prototype.Browser.IE) {
      var t = Element._attributeTranslations.read;
      if (t.values[name]) return t.values[name](element, name);
      if (t.names[name]) name = t.names[name];
      if (name.include(':')) {
        return (!element.attributes || !element.attributes[name]) ? null :
         element.attributes[name].value;
      }
    }
    return element.getAttribute(name);
  },

  writeAttribute: function(element, name, value) {
    element = $(element);
    var attributes = { }, t = Element._attributeTranslations.write;

    if (typeof name == 'object') attributes = name;
    else attributes[name] = Object.isUndefined(value) ? true : value;

    for (var attr in attributes) {
      name = t.names[attr] || attr;
      value = attributes[attr];
      if (t.values[attr]) name = t.values[attr](element, value);
      if (value === false || value === null)
        element.removeAttribute(name);
      else if (value === true)
        element.setAttribute(name, name);
      else element.setAttribute(name, value);
    }
    return element;
  },

  getHeight: function(element) {
    return $(element).getDimensions().height;
  },

  getWidth: function(element) {
    return $(element).getDimensions().width;
  },

  classNames: function(element) {
    return new Element.ClassNames(element);
  },

  hasClassName: function(element, className) {
    if (!(element = $(element))) return;
    var elementClassName = element.className;
    return (elementClassName.length > 0 && (elementClassName == className ||
      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
  },

  addClassName: function(element, className) {
    if (!(element = $(element))) return;
    if (!element.hasClassName(className))
      element.className += (element.className ? ' ' : '') + className;
    return element;
  },

  removeClassName: function(element, className) {
    if (!(element = $(element))) return;
    element.className = element.className.replace(
      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
    return element;
  },

  toggleClassName: function(element, className) {
    if (!(element = $(element))) return;
    return element[element.hasClassName(className) ?
      'removeClassName' : 'addClassName'](className);
  },

  // removes whitespace-only text node children
  cleanWhitespace: function(element) {
    element = $(element);
    var node = element.firstChild;
    while (node) {
      var nextNode = node.nextSibling;
      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
        element.removeChild(node);
      node = nextNode;
    }
    return element;
  },

  empty: function(element) {
    return $(element).innerHTML.blank();
  },

  descendantOf: function(element, ancestor) {
    element = $(element), ancestor = $(ancestor);

    if (element.compareDocumentPosition)
      return (element.compareDocumentPosition(ancestor) & 8) === 8;

    if (ancestor.contains)
      return ancestor.contains(element) && ancestor !== element;

    while (element = element.parentNode)
      if (element == ancestor) return true;

    return false;
  },

  scrollTo: function(element) {
    element = $(element);
    var pos = element.cumulativeOffset();
    window.scrollTo(pos[0], pos[1]);
    return element;
  },

  getStyle: function(element, style) {
    element = $(element);
    style = style == 'float' ? 'cssFloat' : style.camelize();
    var value = element.style[style];
    if (!value || value == 'auto') {
      var css = document.defaultView.getComputedStyle(element, null);
      value = css ? css[style] : null;
    }
    if (style == 'opacity') return value ? parseFloat(value) : 1.0;
    return value == 'auto' ? null : value;
  },

  getOpacity: function(element) {
    return $(element).getStyle('opacity');
  },

  setStyle: function(element, styles) {
    element = $(element);
    var elementStyle = element.style, match;
    if (Object.isString(styles)) {
      element.style.cssText += ';' + styles;
      return styles.include('opacity') ?
        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
    }
    for (var property in styles)
      if (property == 'opacity') element.setOpacity(styles[property]);
      else
        elementStyle[(property == 'float' || property == 'cssFloat') ?
          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
            property] = styles[property];

    return element;
  },

  setOpacity: function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
    return element;
  },

  getDimensions: function(element) {
    element = $(element);
    var display = element.getStyle('display');
    if (display != 'none' && display != null) // Safari bug
      return {width: element.offsetWidth, height: element.offsetHeight};

    // All *Width and *Height properties give 0 on elements with display none,
    // so enable the element temporarily
    var els = element.style;
    var originalVisibility = els.visibility;
    var originalPosition = els.position;
    var originalDisplay = els.display;
    els.visibility = 'hidden';
    els.position = 'absolute';
    els.display = 'block';
    var originalWidth = element.clientWidth;
    var originalHeight = element.clientHeight;
    els.display = originalDisplay;
    els.position = originalPosition;
    els.visibility = originalVisibility;
    return {width: originalWidth, height: originalHeight};
  },

  makePositioned: function(element) {
    element = $(element);
    var pos = Element.getStyle(element, 'position');
    if (pos == 'static' || !pos) {
      element._madePositioned = true;
      element.style.position = 'relative';
      // Opera returns the offset relative to the positioning context, when an
      // element is position relative but top and left have not been defined
      if (Prototype.Browser.Opera) {
        element.style.top = 0;
        element.style.left = 0;
      }
    }
    return element;
  },

  undoPositioned: function(element) {
    element = $(element);
    if (element._madePositioned) {
      element._madePositioned = undefined;
      element.style.position =
        element.style.top =
        element.style.left =
        element.style.bottom =
        element.style.right = '';
    }
    return element;
  },

  makeClipping: function(element) {
    element = $(element);
    if (element._overflow) return element;
    element._overflow = Element.getStyle(element, 'overflow') || 'auto';
    if (element._overflow !== 'hidden')
      element.style.overflow = 'hidden';
    return element;
  },

  undoClipping: function(element) {
    element = $(element);
    if (!element._overflow) return element;
    element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
    element._overflow = null;
    return element;
  },

  cumulativeOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  positionedOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
      if (element) {
        if (element.tagName.toUpperCase() == 'BODY') break;
        var p = Element.getStyle(element, 'position');
        if (p !== 'static') break;
      }
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  absolutize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'absolute') return element;
    // Position.prepare(); // To be done manually by Scripty when it needs it.

    var offsets = element.positionedOffset();
    var top     = offsets[1];
    var left    = offsets[0];
    var width   = element.clientWidth;
    var height  = element.clientHeight;

    element._originalLeft   = left - parseFloat(element.style.left  || 0);
    element._originalTop    = top  - parseFloat(element.style.top || 0);
    element._originalWidth  = element.style.width;
    element._originalHeight = element.style.height;

    element.style.position = 'absolute';
    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.width  = width + 'px';
    element.style.height = height + 'px';
    return element;
  },

  relativize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'relative') return element;
    // Position.prepare(); // To be done manually by Scripty when it needs it.

    element.style.position = 'relative';
    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.height = element._originalHeight;
    element.style.width  = element._originalWidth;
    return element;
  },

  cumulativeScrollOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.scrollTop  || 0;
      valueL += element.scrollLeft || 0;
      element = element.parentNode;
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  getOffsetParent: function(element) {
    if (element.offsetParent) return $(element.offsetParent);
    if (element == document.body) return $(element);

    while ((element = element.parentNode) && element != document.body)
      if (Element.getStyle(element, 'position') != 'static')
        return $(element);

    return $(document.body);
  },

  viewportOffset: function(forElement) {
    var valueT = 0, valueL = 0;

    var element = forElement;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;

      // Safari fix
      if (element.offsetParent == document.body &&
        Element.getStyle(element, 'position') == 'absolute') break;

    } while (element = element.offsetParent);

    element = forElement;
    do {
      if (!Prototype.Browser.Opera || (element.tagName && (element.tagName.toUpperCase() == 'BODY'))) {
        valueT -= element.scrollTop  || 0;
        valueL -= element.scrollLeft || 0;
      }
    } while (element = element.parentNode);

    return Element._returnOffset(valueL, valueT);
  },

  clonePosition: function(element, source) {
    var options = Object.extend({
      setLeft:    true,
      setTop:     true,
      setWidth:   true,
      setHeight:  true,
      offsetTop:  0,
      offsetLeft: 0
    }, arguments[2] || { });

    // find page position of source
    source = $(source);
    var p = source.viewportOffset();

    // find coordinate system to use
    element = $(element);
    var delta = [0, 0];
    var parent = null;
    // delta [0,0] will do fine with position: fixed elements,
    // position:absolute needs offsetParent deltas
    if (Element.getStyle(element, 'position') == 'absolute') {
      parent = element.getOffsetParent();
      delta = parent.viewportOffset();
    }

    // correct by body offsets (fixes Safari)
    if (parent == document.body) {
      delta[0] -= document.body.offsetLeft;
      delta[1] -= document.body.offsetTop;
    }

    // set position
    if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
    if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
    if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
    if (options.setHeight) element.style.height = source.offsetHeight + 'px';
    return element;
  }
};

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
  getElementsBySelector: Element.Methods.select,
  childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
  write: {
    names: {
      className: 'class',
      htmlFor:   'for'
    },
    values: { }
  }
};

if (Prototype.Browser.Opera) {
  Element.Methods.getStyle = Element.Methods.getStyle.wrap(
    function(proceed, element, style) {
      switch (style) {
        case 'left': case 'top': case 'right': case 'bottom':
          if (proceed(element, 'position') === 'static') return null;
        case 'height': case 'width':
          // returns '0px' for hidden elements; we want it to return null
          if (!Element.visible(element)) return null;

          // returns the border-box dimensions rather than the content-box
          // dimensions, so we subtract padding and borders from the value
          var dim = parseInt(proceed(element, style), 10);

          if (dim !== element['offset' + style.capitalize()])
            return dim + 'px';

          var properties;
          if (style === 'height') {
            properties = ['border-top-width', 'padding-top',
             'padding-bottom', 'border-bottom-width'];
          }
          else {
            properties = ['border-left-width', 'padding-left',
             'padding-right', 'border-right-width'];
          }
          return properties.inject(dim, function(memo, property) {
            var val = proceed(element, property);
            return val === null ? memo : memo - parseInt(val, 10);
          }) + 'px';
        default: return proceed(element, style);
      }
    }
  );

  Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
    function(proceed, element, attribute) {
      if (attribute === 'title') return element.title;
      return proceed(element, attribute);
    }
  );
}

else if (Prototype.Browser.IE) {
  // IE doesn't report offsets correctly for static elements, so we change them
  // to "relative" to get the values, then change them back.
  Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
    function(proceed, element) {
      element = $(element);
      // IE throws an error if element is not in document
      try { element.offsetParent }
      catch(e) { return $(document.body) }
      var position = element.getStyle('position');
      if (position !== 'static') return proceed(element);
      element.setStyle({ position: 'relative' });
      var value = proceed(element);
      element.setStyle({ position: position });
      return value;
    }
  );

  $w('positionedOffset viewportOffset').each(function(method) {
    Element.Methods[method] = Element.Methods[method].wrap(
      function(proceed, element) {
        element = $(element);
        try { element.offsetParent }
        catch(e) { return Element._returnOffset(0,0) }
        var position = element.getStyle('position');
        if (position !== 'static') return proceed(element);
        // Trigger hasLayout on the offset parent so that IE6 reports
        // accurate offsetTop and offsetLeft values for position: fixed.
        var offsetParent = element.getOffsetParent();
        if (offsetParent && offsetParent.getStyle('position') === 'fixed')
          offsetParent.setStyle({ zoom: 1 });
        element.setStyle({ position: 'relative' });
        var value = proceed(element);
        element.setStyle({ position: position });
        return value;
      }
    );
  });

  Element.Methods.cumulativeOffset = Element.Methods.cumulativeOffset.wrap(
    function(proceed, element) {
      try { element.offsetParent }
      catch(e) { return Element._returnOffset(0,0) }
      return proceed(element);
    }
  );

  Element.Methods.getStyle = function(element, style) {
    element = $(element);
    style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
    var value = element.style[style];
    if (!value && element.currentStyle) value = element.currentStyle[style];

    if (style == 'opacity') {
      if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
        if (value[1]) return parseFloat(value[1]) / 100;
      return 1.0;
    }

    if (value == 'auto') {
      if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
        return element['offset' + style.capitalize()] + 'px';
      return null;
    }
    return value;
  };

  Element.Methods.setOpacity = function(element, value) {
    function stripAlpha(filter){
      return filter.replace(/alpha\([^\)]*\)/gi,'');
    }
    element = $(element);
    var currentStyle = element.currentStyle;
    if ((currentStyle && !currentStyle.hasLayout) ||
      (!currentStyle && element.style.zoom == 'normal'))
        element.style.zoom = 1;

    var filter = element.getStyle('filter'), style = element.style;
    if (value == 1 || value === '') {
      (filter = stripAlpha(filter)) ?
        style.filter = filter : style.removeAttribute('filter');
      return element;
    } else if (value < 0.00001) value = 0;
    style.filter = stripAlpha(filter) +
      'alpha(opacity=' + (value * 100) + ')';
    return element;
  };

  Element._attributeTranslations = {
    read: {
      names: {
        'class': 'className',
        'for':   'htmlFor'
      },
      values: {
        _getAttr: function(element, attribute) {
          return element.getAttribute(attribute, 2);
        },
        _getAttrNode: function(element, attribute) {
          var node = element.getAttributeNode(attribute);
          return node ? node.value : "";
        },
        _getEv: function(element, attribute) {
          attribute = element.getAttribute(attribute);
          return attribute ? attribute.toString().slice(23, -2) : null;
        },
        _flag: function(element, attribute) {
          return $(element).hasAttribute(attribute) ? attribute : null;
        },
        style: function(element) {
          return element.style.cssText.toLowerCase();
        },
        title: function(element) {
          return element.title;
        }
      }
    }
  };

  Element._attributeTranslations.write = {
    names: Object.extend({
      cellpadding: 'cellPadding',
      cellspacing: 'cellSpacing'
    }, Element._attributeTranslations.read.names),
    values: {
      checked: function(element, value) {
        element.checked = !!value;
      },

      style: function(element, value) {
        element.style.cssText = value ? value : '';
      }
    }
  };

  Element._attributeTranslations.has = {};

  $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
      'encType maxLength readOnly longDesc frameBorder').each(function(attr) {
    Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
    Element._attributeTranslations.has[attr.toLowerCase()] = attr;
  });

  (function(v) {
    Object.extend(v, {
      href:        v._getAttr,
      src:         v._getAttr,
      type:        v._getAttr,
      action:      v._getAttrNode,
      disabled:    v._flag,
      checked:     v._flag,
      readonly:    v._flag,
      multiple:    v._flag,
      onload:      v._getEv,
      onunload:    v._getEv,
      onclick:     v._getEv,
      ondblclick:  v._getEv,
      onmousedown: v._getEv,
      onmouseup:   v._getEv,
      onmouseover: v._getEv,
      onmousemove: v._getEv,
      onmouseout:  v._getEv,
      onfocus:     v._getEv,
      onblur:      v._getEv,
      onkeypress:  v._getEv,
      onkeydown:   v._getEv,
      onkeyup:     v._getEv,
      onsubmit:    v._getEv,
      onreset:     v._getEv,
      onselect:    v._getEv,
      onchange:    v._getEv
    });
  })(Element._attributeTranslations.read.values);
}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
  Element.Methods.setOpacity = function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1) ? 0.999999 :
      (value === '') ? '' : (value < 0.00001) ? 0 : value;
    return element;
  };
}

else if (Prototype.Browser.WebKit) {
  Element.Methods.setOpacity = function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;

    if (value == 1)
      if(element.tagName.toUpperCase() == 'IMG' && element.width) {
        element.width++; element.width--;
      } else try {
        var n = document.createTextNode(' ');
        element.appendChild(n);
        element.removeChild(n);
      } catch (e) { }

    return element;
  };

  // Safari returns margins on body which is incorrect if the child is absolutely
  // positioned.  For performance reasons, redefine Element#cumulativeOffset for
  // KHTML/WebKit only.
  Element.Methods.cumulativeOffset = function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      if (element.offsetParent == document.body)
        if (Element.getStyle(element, 'position') == 'absolute') break;

      element = element.offsetParent;
    } while (element);

    return Element._returnOffset(valueL, valueT);
  };
}

if (Prototype.Browser.IE || Prototype.Browser.Opera) {
  // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
  Element.Methods.update = function(element, content) {
    element = $(element);

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) return element.update().insert(content);

    content = Object.toHTML(content);
    var tagName = element.tagName.toUpperCase();

    if (tagName in Element._insertionTranslations.tags) {
      $A(element.childNodes).each(function(node) { element.removeChild(node) });
      Element._getContentFromAnonymousElement(tagName, content.stripScripts())
        .each(function(node) { element.appendChild(node) });
    }
    else element.innerHTML = content.stripScripts();

    content.evalScripts.bind(content).defer();
    return element;
  };
}

if ('outerHTML' in document.createElement('div')) {
  Element.Methods.replace = function(element, content) {
    element = $(element);

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) {
      element.parentNode.replaceChild(content, element);
      return element;
    }

    content = Object.toHTML(content);
    var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

    if (Element._insertionTranslations.tags[tagName]) {
      var nextSibling = element.next();
      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
      parent.removeChild(element);
      if (nextSibling)
        fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
      else
        fragments.each(function(node) { parent.appendChild(node) });
    }
    else element.outerHTML = content.stripScripts();

    content.evalScripts.bind(content).defer();
    return element;
  };
}

Element._returnOffset = function(l, t) {
  var result = [l, t];
  result.left = l;
  result.top = t;
  return result;
};

Element._getContentFromAnonymousElement = function(tagName, html) {
  var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
  if (t) {
    div.innerHTML = t[0] + html + t[1];
    t[2].times(function() { div = div.firstChild });
  } else div.innerHTML = html;
  return $A(div.childNodes);
};

Element._insertionTranslations = {
  before: function(element, node) {
    element.parentNode.insertBefore(node, element);
  },
  top: function(element, node) {
    element.insertBefore(node, element.firstChild);
  },
  bottom: function(element, node) {
    element.appendChild(node);
  },
  after: function(element, node) {
    element.parentNode.insertBefore(node, element.nextSibling);
  },
  tags: {
    TABLE:  ['<table>',                '</table>',                   1],
    TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
    TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
    TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
    SELECT: ['<select>',               '</select>',                  1]
  }
};

(function() {
  Object.extend(this.tags, {
    THEAD: this.tags.TBODY,
    TFOOT: this.tags.TBODY,
    TH:    this.tags.TD
  });
}).call(Element._insertionTranslations);

Element.Methods.Simulated = {
  hasAttribute: function(element, attribute) {
    attribute = Element._attributeTranslations.has[attribute] || attribute;
    var node = $(element).getAttributeNode(attribute);
    return !!(node && node.specified);
  }
};

Element.Methods.ByTag = { };

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
    document.createElement('div')['__proto__']) {
  window.HTMLElement = { };
  window.HTMLElement.prototype = document.createElement('div')['__proto__'];
  Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.extend = (function() {
  if (Prototype.BrowserFeatures.SpecificElementExtensions)
    return Prototype.K;

  var Methods = { }, ByTag = Element.Methods.ByTag;

  var extend = Object.extend(function(element) {
    if (!element || element._extendedByPrototype ||
        element.nodeType != 1 || element == window) return element;

    var methods = Object.clone(Methods),
      tagName = element.tagName.toUpperCase(), property, value;

    // extend methods for specific tags
    if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

    for (property in methods) {
      value = methods[property];
      if (Object.isFunction(value) && !(property in element))
        element[property] = value.methodize();
    }

    element._extendedByPrototype = Prototype.emptyFunction;
    return element;

  }, {
    refresh: function() {
      // extend methods for all tags (Safari doesn't need this)
      if (!Prototype.BrowserFeatures.ElementExtensions) {
        Object.extend(Methods, Element.Methods);
        Object.extend(Methods, Element.Methods.Simulated);
      }
    }
  });

  extend.refresh();
  return extend;
})();

Element.hasAttribute = function(element, attribute) {
  if (element.hasAttribute) return element.hasAttribute(attribute);
  return Element.Methods.Simulated.hasAttribute(element, attribute);
};

Element.addMethods = function(methods) {
  var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

  if (!methods) {
    Object.extend(Form, Form.Methods);
    Object.extend(Form.Element, Form.Element.Methods);
    Object.extend(Element.Methods.ByTag, {
      "FORM":     Object.clone(Form.Methods),
      "INPUT":    Object.clone(Form.Element.Methods),
      "SELECT":   Object.clone(Form.Element.Methods),
      "TEXTAREA": Object.clone(Form.Element.Methods)
    });
  }

  if (arguments.length == 2) {
    var tagName = methods;
    methods = arguments[1];
  }

  if (!tagName) Object.extend(Element.Methods, methods || { });
  else {
    if (Object.isArray(tagName)) tagName.each(extend);
    else extend(tagName);
  }

  function extend(tagName) {
    tagName = tagName.toUpperCase();
    if (!Element.Methods.ByTag[tagName])
      Element.Methods.ByTag[tagName] = { };
    Object.extend(Element.Methods.ByTag[tagName], methods);
  }

  function copy(methods, destination, onlyIfAbsent) {
    onlyIfAbsent = onlyIfAbsent || false;
    for (var property in methods) {
      var value = methods[property];
      if (!Object.isFunction(value)) continue;
      if (!onlyIfAbsent || !(property in destination))
        destination[property] = value.methodize();
    }
  }

  function findDOMClass(tagName) {
    var klass;
    var trans = {
      "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
      "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
      "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
      "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
      "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
      "FrameSet", "IFRAME": "IFrame"
    };
    if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName.capitalize() + 'Element';
    if (window[klass]) return window[klass];

    window[klass] = { };
    window[klass].prototype = document.createElement(tagName)['__proto__'];
    return window[klass];
  }

  if (F.ElementExtensions) {
    copy(Element.Methods, HTMLElement.prototype);
    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
  }

  if (F.SpecificElementExtensions) {
    for (var tag in Element.Methods.ByTag) {
      var klass = findDOMClass(tag);
      if (Object.isUndefined(klass)) continue;
      copy(T[tag], klass.prototype);
    }
  }

  Object.extend(Element, Element.Methods);
  delete Element.ByTag;

  if (Element.extend.refresh) Element.extend.refresh();
  Element.cache = { };
};

document.viewport = {
  getDimensions: function() {
    var dimensions = { }, B = Prototype.Browser;
    $w('width height').each(function(d) {
      var D = d.capitalize();
      if (B.WebKit && !document.evaluate) {
        // Safari <3.0 needs self.innerWidth/Height
        dimensions[d] = self['inner' + D];
      } else if (B.Opera && parseFloat(window.opera.version()) < 9.5) {
        // Opera <9.5 needs document.body.clientWidth/Height
        dimensions[d] = document.body['client' + D]
      } else {
        dimensions[d] = document.documentElement['client' + D];
      }
    });
    return dimensions;
  },

  getWidth: function() {
    return this.getDimensions().width;
  },

  getHeight: function() {
    return this.getDimensions().height;
  },

  getScrollOffsets: function() {
    return Element._returnOffset(
      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
  }
};
/* Portions of the Selector class are derived from Jack Slocum's DomQuery,
 * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
 * license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
  initialize: function(expression) {
    this.expression = expression.strip();

    if (this.shouldUseSelectorsAPI()) {
      this.mode = 'selectorsAPI';
    } else if (this.shouldUseXPath()) {
      this.mode = 'xpath';
      this.compileXPathMatcher();
    } else {
      this.mode = "normal";
      this.compileMatcher();
    }

  },

  shouldUseXPath: function() {
    if (!Prototype.BrowserFeatures.XPath) return false;

    var e = this.expression;

    // Safari 3 chokes on :*-of-type and :empty
    if (Prototype.Browser.WebKit &&
     (e.include("-of-type") || e.include(":empty")))
      return false;

    // XPath can't do namespaced attributes, nor can it read
    // the "checked" property from DOM nodes
    if ((/(\[[\w-]*?:|:checked)/).test(e))
      return false;

    return true;
  },

  shouldUseSelectorsAPI: function() {
    if (!Prototype.BrowserFeatures.SelectorsAPI) return false;

    if (!Selector._div) Selector._div = new Element('div');

    // Make sure the browser treats the selector as valid. Test on an
    // isolated element to minimize cost of this check.
    try {
      Selector._div.querySelector(this.expression);
    } catch(e) {
      return false;
    }

    return true;
  },

  compileMatcher: function() {
    var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
        c = Selector.criteria, le, p, m;

    if (Selector._cache[e]) {
      this.matcher = Selector._cache[e];
      return;
    }

    this.matcher = ["this.matcher = function(root) {",
                    "var r = root, h = Selector.handlers, c = false, n;"];

    while (e && le != e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        p = ps[i];
        if (m = e.match(p)) {
          this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
            new Template(c[i]).evaluate(m));
          e = e.replace(m[0], '');
          break;
        }
      }
    }

    this.matcher.push("return h.unique(n);\n}");
    eval(this.matcher.join('\n'));
    Selector._cache[this.expression] = this.matcher;
  },

  compileXPathMatcher: function() {
    var e = this.expression, ps = Selector.patterns,
        x = Selector.xpath, le, m;

    if (Selector._cache[e]) {
      this.xpath = Selector._cache[e]; return;
    }

    this.matcher = ['.//*'];
    while (e && le != e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        if (m = e.match(ps[i])) {
          this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
            new Template(x[i]).evaluate(m));
          e = e.replace(m[0], '');
          break;
        }
      }
    }

    this.xpath = this.matcher.join('');
    Selector._cache[this.expression] = this.xpath;
  },

  findElements: function(root) {
    root = root || document;
    var e = this.expression, results;

    switch (this.mode) {
      case 'selectorsAPI':
        // querySelectorAll queries document-wide, then filters to descendants
        // of the context element. That's not what we want.
        // Add an explicit context to the selector if necessary.
        if (root !== document) {
          var oldId = root.id, id = $(root).identify();
          e = "#" + id + " " + e;
        }

        results = $A(root.querySelectorAll(e)).map(Element.extend);
        root.id = oldId;

        return results;
      case 'xpath':
        return document._getElementsByXPath(this.xpath, root);
      default:
       return this.matcher(root);
    }
  },

  match: function(element) {
    this.tokens = [];

    var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
    var le, p, m;

    while (e && le !== e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        p = ps[i];
        if (m = e.match(p)) {
          // use the Selector.assertions methods unless the selector
          // is too complex.
          if (as[i]) {
            this.tokens.push([i, Object.clone(m)]);
            e = e.replace(m[0], '');
          } else {
            // reluctantly do a document-wide search
            // and look for a match in the array
            return this.findElements(document).include(element);
          }
        }
      }
    }

    var match = true, name, matches;
    for (var i = 0, token; token = this.tokens[i]; i++) {
      name = token[0], matches = token[1];
      if (!Selector.assertions[name](element, matches)) {
        match = false; break;
      }
    }

    return match;
  },

  toString: function() {
    return this.expression;
  },

  inspect: function() {
    return "#<Selector:" + this.expression.inspect() + ">";
  }
});

Object.extend(Selector, {
  _cache: { },

  xpath: {
    descendant:   "//*",
    child:        "/*",
    adjacent:     "/following-sibling::*[1]",
    laterSibling: '/following-sibling::*',
    tagName:      function(m) {
      if (m[1] == '*') return '';
      return "[local-name()='" + m[1].toLowerCase() +
             "' or local-name()='" + m[1].toUpperCase() + "']";
    },
    className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
    id:           "[@id='#{1}']",
    attrPresence: function(m) {
      m[1] = m[1].toLowerCase();
      return new Template("[@#{1}]").evaluate(m);
    },
    attr: function(m) {
      m[1] = m[1].toLowerCase();
      m[3] = m[5] || m[6];
      return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
    },
    pseudo: function(m) {
      var h = Selector.xpath.pseudos[m[1]];
      if (!h) return '';
      if (Object.isFunction(h)) return h(m);
      return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
    },
    operators: {
      '=':  "[@#{1}='#{3}']",
      '!=': "[@#{1}!='#{3}']",
      '^=': "[starts-with(@#{1}, '#{3}')]",
      '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
      '*=': "[contains(@#{1}, '#{3}')]",
      '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
      '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
    },
    pseudos: {
      'first-child': '[not(preceding-sibling::*)]',
      'last-child':  '[not(following-sibling::*)]',
      'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
      'empty':       "[count(*) = 0 and (count(text()) = 0)]",
      'checked':     "[@checked]",
      'disabled':    "[(@disabled) and (@type!='hidden')]",
      'enabled':     "[not(@disabled) and (@type!='hidden')]",
      'not': function(m) {
        var e = m[6], p = Selector.patterns,
            x = Selector.xpath, le, v;

        var exclusion = [];
        while (e && le != e && (/\S/).test(e)) {
          le = e;
          for (var i in p) {
            if (m = e.match(p[i])) {
              v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
              exclusion.push("(" + v.substring(1, v.length - 1) + ")");
              e = e.replace(m[0], '');
              break;
            }
          }
        }
        return "[not(" + exclusion.join(" and ") + ")]";
      },
      'nth-child':      function(m) {
        return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
      },
      'nth-last-child': function(m) {
        return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
      },
      'nth-of-type':    function(m) {
        return Selector.xpath.pseudos.nth("position() ", m);
      },
      'nth-last-of-type': function(m) {
        return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
      },
      'first-of-type':  function(m) {
        m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
      },
      'last-of-type':   function(m) {
        m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
      },
      'only-of-type':   function(m) {
        var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
      },
      nth: function(fragment, m) {
        var mm, formula = m[6], predicate;
        if (formula == 'even') formula = '2n+0';
        if (formula == 'odd')  formula = '2n+1';
        if (mm = formula.match(/^(\d+)$/)) // digit only
          return '[' + fragment + "= " + mm[1] + ']';
        if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
          if (mm[1] == "-") mm[1] = -1;
          var a = mm[1] ? Number(mm[1]) : 1;
          var b = mm[2] ? Number(mm[2]) : 0;
          predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
          "((#{fragment} - #{b}) div #{a} >= 0)]";
          return new Template(predicate).evaluate({
            fragment: fragment, a: a, b: b });
        }
      }
    }
  },

  criteria: {
    tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
    className:    'n = h.className(n, r, "#{1}", c);    c = false;',
    id:           'n = h.id(n, r, "#{1}", c);           c = false;',
    attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
    attr: function(m) {
      m[3] = (m[5] || m[6]);
      return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
    },
    pseudo: function(m) {
      if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
      return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
    },
    descendant:   'c = "descendant";',
    child:        'c = "child";',
    adjacent:     'c = "adjacent";',
    laterSibling: 'c = "laterSibling";'
  },

  patterns: {
    // combinators must be listed first
    // (and descendant needs to be last combinator)
    laterSibling: /^\s*~\s*/,
    child:        /^\s*>\s*/,
    adjacent:     /^\s*\+\s*/,
    descendant:   /^\s/,

    // selectors follow
    tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
    id:           /^#([\w\-\*]+)(\b|$)/,
    className:    /^\.([\w\-\*]+)(\b|$)/,
    pseudo:
/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
    attrPresence: /^\[((?:[\w]+:)?[\w]+)\]/,
    attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
  },

  // for Selector.match and Element#match
  assertions: {
    tagName: function(element, matches) {
      return matches[1].toUpperCase() == element.tagName.toUpperCase();
    },

    className: function(element, matches) {
      return Element.hasClassName(element, matches[1]);
    },

    id: function(element, matches) {
      return element.id === matches[1];
    },

    attrPresence: function(element, matches) {
      return Element.hasAttribute(element, matches[1]);
    },

    attr: function(element, matches) {
      var nodeValue = Element.readAttribute(element, matches[1]);
      return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
    }
  },

  handlers: {
    // UTILITY FUNCTIONS
    // joins two collections
    concat: function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        a.push(node);
      return a;
    },

    // marks an array of nodes for counting
    mark: function(nodes) {
      var _true = Prototype.emptyFunction;
      for (var i = 0, node; node = nodes[i]; i++)
        node._countedByPrototype = _true;
      return nodes;
    },

    unmark: function(nodes) {
      for (var i = 0, node; node = nodes[i]; i++)
        node._countedByPrototype = undefined;
      return nodes;
    },

    // mark each child node with its position (for nth calls)
    // "ofType" flag indicates whether we're indexing for nth-of-type
    // rather than nth-child
    index: function(parentNode, reverse, ofType) {
      parentNode._countedByPrototype = Prototype.emptyFunction;
      if (reverse) {
        for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
          var node = nodes[i];
          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
        }
      } else {
        for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
      }
    },

    // filters out duplicates and extends all nodes
    unique: function(nodes) {
      if (nodes.length == 0) return nodes;
      var results = [], n;
      for (var i = 0, l = nodes.length; i < l; i++)
        if (!(n = nodes[i])._countedByPrototype) {
          n._countedByPrototype = Prototype.emptyFunction;
          results.push(Element.extend(n));
        }
      return Selector.handlers.unmark(results);
    },

    // COMBINATOR FUNCTIONS
    descendant: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        h.concat(results, node.getElementsByTagName('*'));
      return results;
    },

    child: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        for (var j = 0, child; child = node.childNodes[j]; j++)
          if (child.nodeType == 1 && child.tagName != '!') results.push(child);
      }
      return results;
    },

    adjacent: function(nodes) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        var next = this.nextElementSibling(node);
        if (next) results.push(next);
      }
      return results;
    },

    laterSibling: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        h.concat(results, Element.nextSiblings(node));
      return results;
    },

    nextElementSibling: function(node) {
      while (node = node.nextSibling)
        if (node.nodeType == 1) return node;
      return null;
    },

    previousElementSibling: function(node) {
      while (node = node.previousSibling)
        if (node.nodeType == 1) return node;
      return null;
    },

    // TOKEN FUNCTIONS
    tagName: function(nodes, root, tagName, combinator) {
      var uTagName = tagName.toUpperCase();
      var results = [], h = Selector.handlers;
      if (nodes) {
        if (combinator) {
          // fastlane for ordinary descendant combinators
          if (combinator == "descendant") {
            for (var i = 0, node; node = nodes[i]; i++)
              h.concat(results, node.getElementsByTagName(tagName));
            return results;
          } else nodes = this[combinator](nodes);
          if (tagName == "*") return nodes;
        }
        for (var i = 0, node; node = nodes[i]; i++)
          if (node.tagName.toUpperCase() === uTagName) results.push(node);
        return results;
      } else return root.getElementsByTagName(tagName);
    },

    id: function(nodes, root, id, combinator) {
      var targetNode = $(id), h = Selector.handlers;
      if (!targetNode) return [];
      if (!nodes && root == document) return [targetNode];
      if (nodes) {
        if (combinator) {
          if (combinator == 'child') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (targetNode.parentNode == node) return [targetNode];
          } else if (combinator == 'descendant') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (Element.descendantOf(targetNode, node)) return [targetNode];
          } else if (combinator == 'adjacent') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (Selector.handlers.previousElementSibling(targetNode) == node)
                return [targetNode];
          } else nodes = h[combinator](nodes);
        }
        for (var i = 0, node; node = nodes[i]; i++)
          if (node == targetNode) return [targetNode];
        return [];
      }
      return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
    },

    className: function(nodes, root, className, combinator) {
      if (nodes && combinator) nodes = this[combinator](nodes);
      return Selector.handlers.byClassName(nodes, root, className);
    },

    byClassName: function(nodes, root, className) {
      if (!nodes) nodes = Selector.handlers.descendant([root]);
      var needle = ' ' + className + ' ';
      for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
        nodeClassName = node.className;
        if (nodeClassName.length == 0) continue;
        if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
          results.push(node);
      }
      return results;
    },

    attrPresence: function(nodes, root, attr, combinator) {
      if (!nodes) nodes = root.getElementsByTagName("*");
      if (nodes && combinator) nodes = this[combinator](nodes);
      var results = [];
      for (var i = 0, node; node = nodes[i]; i++)
        if (Element.hasAttribute(node, attr)) results.push(node);
      return results;
    },

    attr: function(nodes, root, attr, value, operator, combinator) {
      if (!nodes) nodes = root.getElementsByTagName("*");
      if (nodes && combinator) nodes = this[combinator](nodes);
      var handler = Selector.operators[operator], results = [];
      for (var i = 0, node; node = nodes[i]; i++) {
        var nodeValue = Element.readAttribute(node, attr);
        if (nodeValue === null) continue;
        if (handler(nodeValue, value)) results.push(node);
      }
      return results;
    },

    pseudo: function(nodes, name, value, root, combinator) {
      if (nodes && combinator) nodes = this[combinator](nodes);
      if (!nodes) nodes = root.getElementsByTagName("*");
      return Selector.pseudos[name](nodes, value, root);
    }
  },

  pseudos: {
    'first-child': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        if (Selector.handlers.previousElementSibling(node)) continue;
          results.push(node);
      }
      return results;
    },
    'last-child': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        if (Selector.handlers.nextElementSibling(node)) continue;
          results.push(node);
      }
      return results;
    },
    'only-child': function(nodes, value, root) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
          results.push(node);
      return results;
    },
    'nth-child':        function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root);
    },
    'nth-last-child':   function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, true);
    },
    'nth-of-type':      function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, false, true);
    },
    'nth-last-of-type': function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, true, true);
    },
    'first-of-type':    function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, "1", root, false, true);
    },
    'last-of-type':     function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, "1", root, true, true);
    },
    'only-of-type':     function(nodes, formula, root) {
      var p = Selector.pseudos;
      return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
    },

    // handles the an+b logic
    getIndices: function(a, b, total) {
      if (a == 0) return b > 0 ? [b] : [];
      return $R(1, total).inject([], function(memo, i) {
        if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
        return memo;
      });
    },

    // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
    nth: function(nodes, formula, root, reverse, ofType) {
      if (nodes.length == 0) return [];
      if (formula == 'even') formula = '2n+0';
      if (formula == 'odd')  formula = '2n+1';
      var h = Selector.handlers, results = [], indexed = [], m;
      h.mark(nodes);
      for (var i = 0, node; node = nodes[i]; i++) {
        if (!node.parentNode._countedByPrototype) {
          h.index(node.parentNode, reverse, ofType);
          indexed.push(node.parentNode);
        }
      }
      if (formula.match(/^\d+$/)) { // just a number
        formula = Number(formula);
        for (var i = 0, node; node = nodes[i]; i++)
          if (node.nodeIndex == formula) results.push(node);
      } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
        if (m[1] == "-") m[1] = -1;
        var a = m[1] ? Number(m[1]) : 1;
        var b = m[2] ? Number(m[2]) : 0;
        var indices = Selector.pseudos.getIndices(a, b, nodes.length);
        for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
          for (var j = 0; j < l; j++)
            if (node.nodeIndex == indices[j]) results.push(node);
        }
      }
      h.unmark(nodes);
      h.unmark(indexed);
      return results;
    },

    'empty': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        // IE treats comments as element nodes
        if (node.tagName == '!' || node.firstChild) continue;
        results.push(node);
      }
      return results;
    },

    'not': function(nodes, selector, root) {
      var h = Selector.handlers, selectorType, m;
      var exclusions = new Selector(selector).findElements(root);
      h.mark(exclusions);
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node._countedByPrototype) results.push(node);
      h.unmark(exclusions);
      return results;
    },

    'enabled': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node.disabled && (!node.type || node.type !== 'hidden'))
          results.push(node);
      return results;
    },

    'disabled': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.disabled) results.push(node);
      return results;
    },

    'checked': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.checked) results.push(node);
      return results;
    }
  },

  operators: {
    '=':  function(nv, v) { return nv == v; },
    '!=': function(nv, v) { return nv != v; },
    '^=': function(nv, v) { return nv == v || nv && nv.startsWith(v); },
    '$=': function(nv, v) { return nv == v || nv && nv.endsWith(v); },
    '*=': function(nv, v) { return nv == v || nv && nv.include(v); },
    '$=': function(nv, v) { return nv.endsWith(v); },
    '*=': function(nv, v) { return nv.include(v); },
    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
    '|=': function(nv, v) { return ('-' + (nv || "").toUpperCase() +
     '-').include('-' + (v || "").toUpperCase() + '-'); }
  },

  split: function(expression) {
    var expressions = [];
    expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
      expressions.push(m[1].strip());
    });
    return expressions;
  },

  matchElements: function(elements, expression) {
    var matches = $$(expression), h = Selector.handlers;
    h.mark(matches);
    for (var i = 0, results = [], element; element = elements[i]; i++)
      if (element._countedByPrototype) results.push(element);
    h.unmark(matches);
    return results;
  },

  findElement: function(elements, expression, index) {
    if (Object.isNumber(expression)) {
      index = expression; expression = false;
    }
    return Selector.matchElements(elements, expression || '*')[index || 0];
  },

  findChildElements: function(element, expressions) {
    expressions = Selector.split(expressions.join(','));
    var results = [], h = Selector.handlers;
    for (var i = 0, l = expressions.length, selector; i < l; i++) {
      selector = new Selector(expressions[i].strip());
      h.concat(results, selector.findElements(element));
    }
    return (l > 1) ? h.unique(results) : results;
  }
});

if (Prototype.Browser.IE) {
  Object.extend(Selector.handlers, {
    // IE returns comment nodes on getElementsByTagName("*").
    // Filter them out.
    concat: function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        if (node.tagName !== "!") a.push(node);
      return a;
    },

    // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
    unmark: function(nodes) {
      for (var i = 0, node; node = nodes[i]; i++)
        node.removeAttribute('_countedByPrototype');
      return nodes;
    }
  });
}

function $$() {
  return Selector.findChildElements(document, $A(arguments));
}
var Form = {
  reset: function(form) {
    $(form).reset();
    return form;
  },

  serializeElements: function(elements, options) {
    if (typeof options != 'object') options = { hash: !!options };
    else if (Object.isUndefined(options.hash)) options.hash = true;
    var key, value, submitted = false, submit = options.submit;

    var data = elements.inject({ }, function(result, element) {
      if (!element.disabled && element.name) {
        key = element.name; value = $(element).getValue();
        if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
            submit !== false && (!submit || key == submit) && (submitted = true)))) {
          if (key in result) {
            // a key is already present; construct an array of values
            if (!Object.isArray(result[key])) result[key] = [result[key]];
            result[key].push(value);
          }
          else result[key] = value;
        }
      }
      return result;
    });

    return options.hash ? data : Object.toQueryString(data);
  }
};

Form.Methods = {
  serialize: function(form, options) {
    return Form.serializeElements(Form.getElements(form), options);
  },

  getElements: function(form) {
    return $A($(form).getElementsByTagName('*')).inject([],
      function(elements, child) {
        if (Form.Element.Serializers[child.tagName.toLowerCase()])
          elements.push(Element.extend(child));
        return elements;
      }
    );
  },

  getInputs: function(form, typeName, name) {
    form = $(form);
    var inputs = form.getElementsByTagName('input');

    if (!typeName && !name) return $A(inputs).map(Element.extend);

    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
      var input = inputs[i];
      if ((typeName && input.type != typeName) || (name && input.name != name))
        continue;
      matchingInputs.push(Element.extend(input));
    }

    return matchingInputs;
  },

  disable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('disable');
    return form;
  },

  enable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('enable');
    return form;
  },

  findFirstElement: function(form) {
    var elements = $(form).getElements().findAll(function(element) {
      return 'hidden' != element.type && !element.disabled;
    });
    var firstByIndex = elements.findAll(function(element) {
      return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
    }).sortBy(function(element) { return element.tabIndex }).first();

    return firstByIndex ? firstByIndex : elements.find(function(element) {
      return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
    });
  },

  focusFirstElement: function(form) {
    form = $(form);
    form.findFirstElement().activate();
    return form;
  },

  request: function(form, options) {
    form = $(form), options = Object.clone(options || { });

    var params = options.parameters, action = form.readAttribute('action') || '';
    if (action.blank()) action = window.location.href;
    options.parameters = form.serialize(true);

    if (params) {
      if (Object.isString(params)) params = params.toQueryParams();
      Object.extend(options.parameters, params);
    }

    if (form.hasAttribute('method') && !options.method)
      options.method = form.method;

    return new Ajax.Request(action, options);
  }
};

/*--------------------------------------------------------------------------*/

Form.Element = {
  focus: function(element) {
    $(element).focus();
    return element;
  },

  select: function(element) {
    $(element).select();
    return element;
  }
};

Form.Element.Methods = {
  serialize: function(element) {
    element = $(element);
    if (!element.disabled && element.name) {
      var value = element.getValue();
      if (value != undefined) {
        var pair = { };
        pair[element.name] = value;
        return Object.toQueryString(pair);
      }
    }
    return '';
  },

  getValue: function(element) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    return Form.Element.Serializers[method](element);
  },

  setValue: function(element, value) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    Form.Element.Serializers[method](element, value);
    return element;
  },

  clear: function(element) {
    $(element).value = '';
    return element;
  },

  present: function(element) {
    return $(element).value != '';
  },

  activate: function(element) {
    element = $(element);
    try {
      element.focus();
      if (element.select && (element.tagName.toLowerCase() != 'input' ||
          !['button', 'reset', 'submit'].include(element.type)))
        element.select();
    } catch (e) { }
    return element;
  },

  disable: function(element) {
    element = $(element);
    element.disabled = true;
    return element;
  },

  enable: function(element) {
    element = $(element);
    element.disabled = false;
    return element;
  }
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;
var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = {
  input: function(element, value) {
    switch (element.type.toLowerCase()) {
      case 'checkbox':
      case 'radio':
        return Form.Element.Serializers.inputSelector(element, value);
      default:
        return Form.Element.Serializers.textarea(element, value);
    }
  },

  inputSelector: function(element, value) {
    if (Object.isUndefined(value)) return element.checked ? element.value : null;
    else element.checked = !!value;
  },

  textarea: function(element, value) {
    if (Object.isUndefined(value)) return element.value;
    else element.value = value;
  },

  select: function(element, value) {
    if (Object.isUndefined(value))
      return this[element.type == 'select-one' ?
        'selectOne' : 'selectMany'](element);
    else {
      var opt, currentValue, single = !Object.isArray(value);
      for (var i = 0, length = element.length; i < length; i++) {
        opt = element.options[i];
        currentValue = this.optionValue(opt);
        if (single) {
          if (currentValue == value) {
            opt.selected = true;
            return;
          }
        }
        else opt.selected = value.include(currentValue);
      }
    }
  },

  selectOne: function(element) {
    var index = element.selectedIndex;
    return index >= 0 ? this.optionValue(element.options[index]) : null;
  },

  selectMany: function(element) {
    var values, length = element.length;
    if (!length) return null;

    for (var i = 0, values = []; i < length; i++) {
      var opt = element.options[i];
      if (opt.selected) values.push(this.optionValue(opt));
    }
    return values;
  },

  optionValue: function(opt) {
    // extend element because hasAttribute may not be native
    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
  }
};

/*--------------------------------------------------------------------------*/

Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
  initialize: function($super, element, frequency, callback) {
    $super(callback, frequency);
    this.element   = $(element);
    this.lastValue = this.getValue();
  },

  execute: function() {
    var value = this.getValue();
    if (Object.isString(this.lastValue) && Object.isString(value) ?
        this.lastValue != value : String(this.lastValue) != String(value)) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  }
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});

Form.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
  initialize: function(element, callback) {
    this.element  = $(element);
    this.callback = callback;

    this.lastValue = this.getValue();
    if (this.element.tagName.toLowerCase() == 'form')
      this.registerFormCallbacks();
    else
      this.registerCallback(this.element);
  },

  onElementEvent: function() {
    var value = this.getValue();
    if (this.lastValue != value) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  },

  registerFormCallbacks: function() {
    Form.getElements(this.element).each(this.registerCallback, this);
  },

  registerCallback: function(element) {
    if (element.type) {
      switch (element.type.toLowerCase()) {
        case 'checkbox':
        case 'radio':
          Event.observe(element, 'click', this.onElementEvent.bind(this));
          break;
        default:
          Event.observe(element, 'change', this.onElementEvent.bind(this));
          break;
      }
    }
  }
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});
if (!window.Event) var Event = { };

Object.extend(Event, {
  KEY_BACKSPACE: 8,
  KEY_TAB:       9,
  KEY_RETURN:   13,
  KEY_ESC:      27,
  KEY_LEFT:     37,
  KEY_UP:       38,
  KEY_RIGHT:    39,
  KEY_DOWN:     40,
  KEY_DELETE:   46,
  KEY_HOME:     36,
  KEY_END:      35,
  KEY_PAGEUP:   33,
  KEY_PAGEDOWN: 34,
  KEY_INSERT:   45,

  cache: { },

  relatedTarget: function(event) {
    var element;
    switch(event.type) {
      case 'mouseover': element = event.fromElement; break;
      case 'mouseout':  element = event.toElement;   break;
      default: return null;
    }
    return Element.extend(element);
  }
});

Event.Methods = (function() {
  var isButton;

  if (Prototype.Browser.IE) {
    var buttonMap = { 0: 1, 1: 4, 2: 2 };
    isButton = function(event, code) {
      return event.button == buttonMap[code];
    };

  } else if (Prototype.Browser.WebKit) {
    isButton = function(event, code) {
      switch (code) {
        case 0: return event.which == 1 && !event.metaKey;
        case 1: return event.which == 1 && event.metaKey;
        default: return false;
      }
    };

  } else {
    isButton = function(event, code) {
      return event.which ? (event.which === code + 1) : (event.button === code);
    };
  }

  return {
    isLeftClick:   function(event) { return isButton(event, 0) },
    isMiddleClick: function(event) { return isButton(event, 1) },
    isRightClick:  function(event) { return isButton(event, 2) },

    element: function(event) {
      event = Event.extend(event);

      var node          = event.target,
          type          = event.type,
          currentTarget = event.currentTarget;

      if (currentTarget && currentTarget.tagName) {
        // Firefox screws up the "click" event when moving between radio buttons
        // via arrow keys. It also screws up the "load" and "error" events on images,
        // reporting the document as the target instead of the original image.
        if (type === 'load' || type === 'error' ||
          (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
            && currentTarget.type === 'radio'))
              node = currentTarget;
      }
      if (node.nodeType == Node.TEXT_NODE) node = node.parentNode;
      return Element.extend(node);
    },

    findElement: function(event, expression) {
      var element = Event.element(event);
      if (!expression) return element;
      var elements = [element].concat(element.ancestors());
      return Selector.findElement(elements, expression, 0);
    },

    pointer: function(event) {
      var docElement = document.documentElement,
      body = document.body || { scrollLeft: 0, scrollTop: 0 };
      return {
        x: event.pageX || (event.clientX +
          (docElement.scrollLeft || body.scrollLeft) -
          (docElement.clientLeft || 0)),
        y: event.pageY || (event.clientY +
          (docElement.scrollTop || body.scrollTop) -
          (docElement.clientTop || 0))
      };
    },

    pointerX: function(event) { return Event.pointer(event).x },
    pointerY: function(event) { return Event.pointer(event).y },

    stop: function(event) {
      Event.extend(event);
      event.preventDefault();
      event.stopPropagation();
      event.stopped = true;
    }
  };
})();

Event.extend = (function() {
  var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
    m[name] = Event.Methods[name].methodize();
    return m;
  });

  if (Prototype.Browser.IE) {
    Object.extend(methods, {
      stopPropagation: function() { this.cancelBubble = true },
      preventDefault:  function() { this.returnValue = false },
      inspect: function() { return "[object Event]" }
    });

    return function(event) {
      if (!event) return false;
      if (event._extendedByPrototype) return event;

      event._extendedByPrototype = Prototype.emptyFunction;
      var pointer = Event.pointer(event);
      Object.extend(event, {
        target: event.srcElement,
        relatedTarget: Event.relatedTarget(event),
        pageX:  pointer.x,
        pageY:  pointer.y
      });
      return Object.extend(event, methods);
    };

  } else {
    Event.prototype = Event.prototype || document.createEvent("HTMLEvents")['__proto__'];
    Object.extend(Event.prototype, methods);
    return Prototype.K;
  }
})();

Object.extend(Event, (function() {
  var cache = Event.cache;

  function getEventID(element) {
    if (element._prototypeEventID) return element._prototypeEventID[0];
    arguments.callee.id = arguments.callee.id || 1;
    return element._prototypeEventID = [++arguments.callee.id];
  }

  function getDOMEventName(eventName) {
    if (eventName && eventName.include(':')) return "dataavailable";
    return eventName;
  }

  function getCacheForID(id) {
    return cache[id] = cache[id] || { };
  }

  function getWrappersForEventName(id, eventName) {
    var c = getCacheForID(id);
    return c[eventName] = c[eventName] || [];
  }

  function createWrapper(element, eventName, handler) {
    var id = getEventID(element);
    var c = getWrappersForEventName(id, eventName);
    if (c.pluck("handler").include(handler)) return false;

    var wrapper = function(event) {
      if (!Event || !Event.extend ||
        (event.eventName && event.eventName != eventName))
          return false;

      Event.extend(event);
      handler.call(element, event);
    };

    wrapper.handler = handler;
    c.push(wrapper);
    return wrapper;
  }

  function findWrapper(id, eventName, handler) {
    var c = getWrappersForEventName(id, eventName);
    return c.find(function(wrapper) { return wrapper.handler == handler });
  }

  function destroyWrapper(id, eventName, handler) {
    var c = getCacheForID(id);
    if (!c[eventName]) return false;
    c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
  }

  function destroyCache() {
    for (var id in cache)
      for (var eventName in cache[id])
        cache[id][eventName] = null;
  }


  // Internet Explorer needs to remove event handlers on page unload
  // in order to avoid memory leaks.
  if (window.attachEvent) {
    window.attachEvent("onunload", destroyCache);
  }

  // Safari has a dummy event handler on page unload so that it won't
  // use its bfcache. Safari <= 3.1 has an issue with restoring the "document"
  // object when page is returned to via the back button using its bfcache.
  if (Prototype.Browser.WebKit) {
    window.addEventListener('unload', Prototype.emptyFunction, false);
  }

  return {
    observe: function(element, eventName, handler) {
      element = $(element);
      var name = getDOMEventName(eventName);

      var wrapper = createWrapper(element, eventName, handler);
      if (!wrapper) return element;

      if (element.addEventListener) {
        element.addEventListener(name, wrapper, false);
      } else {
        element.attachEvent("on" + name, wrapper);
      }

      return element;
    },

    stopObserving: function(element, eventName, handler) {
      element = $(element);
      var id = getEventID(element), name = getDOMEventName(eventName);

      if (!handler && eventName) {
        getWrappersForEventName(id, eventName).each(function(wrapper) {
          element.stopObserving(eventName, wrapper.handler);
        });
        return element;

      } else if (!eventName) {
        Object.keys(getCacheForID(id)).each(function(eventName) {
          element.stopObserving(eventName);
        });
        return element;
      }

      var wrapper = findWrapper(id, eventName, handler);
      if (!wrapper) return element;

      if (element.removeEventListener) {
        element.removeEventListener(name, wrapper, false);
      } else {
        element.detachEvent("on" + name, wrapper);
      }

      destroyWrapper(id, eventName, handler);

      return element;
    },

    fire: function(element, eventName, memo) {
      element = $(element);
      if (element == document && document.createEvent && !element.dispatchEvent)
        element = document.documentElement;

      var event;
      if (document.createEvent) {
        event = document.createEvent("HTMLEvents");
        event.initEvent("dataavailable", true, true);
      } else {
        event = document.createEventObject();
        event.eventType = "ondataavailable";
      }

      event.eventName = eventName;
      event.memo = memo || { };

      if (document.createEvent) {
        element.dispatchEvent(event);
      } else {
        element.fireEvent(event.eventType, event);
      }

      return Event.extend(event);
    }
  };
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
  fire:          Event.fire,
  observe:       Event.observe,
  stopObserving: Event.stopObserving
});

Object.extend(document, {
  fire:          Element.Methods.fire.methodize(),
  observe:       Element.Methods.observe.methodize(),
  stopObserving: Element.Methods.stopObserving.methodize(),
  loaded:        false
});

(function() {
  /* Support for the DOMContentLoaded event is based on work by Dan Webb,
     Matthias Miller, Dean Edwards and John Resig. */

  var timer;

  function fireContentLoadedEvent() {
    if (document.loaded) return;
    if (timer) window.clearInterval(timer);
    document.fire("dom:loaded");
    document.loaded = true;
  }

  if (document.addEventListener) {
    if (Prototype.Browser.WebKit) {
      timer = window.setInterval(function() {
        if (/loaded|complete/.test(document.readyState))
          fireContentLoadedEvent();
      }, 0);

      Event.observe(window, "load", fireContentLoadedEvent);

    } else {
      document.addEventListener("DOMContentLoaded",
        fireContentLoadedEvent, false);
    }

  } else {
    document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
    $("__onDOMContentLoaded").onreadystatechange = function() {
      if (this.readyState == "complete") {
        this.onreadystatechange = null;
        fireContentLoadedEvent();
      }
    };
  }
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
  Before: function(element, content) {
    return Element.insert(element, {before:content});
  },

  Top: function(element, content) {
    return Element.insert(element, {top:content});
  },

  Bottom: function(element, content) {
    return Element.insert(element, {bottom:content});
  },

  After: function(element, content) {
    return Element.insert(element, {after:content});
  }
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

// This should be moved to script.aculo.us; notice the deprecated methods
// further below, that map to the newer Element methods.
var Position = {
  // set to true if needed, warning: firefox performance problems
  // NOT neeeded for page scrolling, only if draggable contained in
  // scrollable elements
  includeScrollOffsets: false,

  // must be called before calling withinIncludingScrolloffset, every time the
  // page is scrolled
  prepare: function() {
    this.deltaX =  window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
    this.deltaY =  window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
  },

  // caches x/y coordinate pair to use with overlap
  within: function(element, x, y) {
    if (this.includeScrollOffsets)
      return this.withinIncludingScrolloffsets(element, x, y);
    this.xcomp = x;
    this.ycomp = y;
    this.offset = Element.cumulativeOffset(element);

    return (y >= this.offset[1] &&
            y <  this.offset[1] + element.offsetHeight &&
            x >= this.offset[0] &&
            x <  this.offset[0] + element.offsetWidth);
  },

  withinIncludingScrolloffsets: function(element, x, y) {
    var offsetcache = Element.cumulativeScrollOffset(element);

    this.xcomp = x + offsetcache[0] - this.deltaX;
    this.ycomp = y + offsetcache[1] - this.deltaY;
    this.offset = Element.cumulativeOffset(element);

    return (this.ycomp >= this.offset[1] &&
            this.ycomp <  this.offset[1] + element.offsetHeight &&
            this.xcomp >= this.offset[0] &&
            this.xcomp <  this.offset[0] + element.offsetWidth);
  },

  // within must be called directly before
  overlap: function(mode, element) {
    if (!mode) return 0;
    if (mode == 'vertical')
      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
        element.offsetHeight;
    if (mode == 'horizontal')
      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
        element.offsetWidth;
  },

  // Deprecation layer -- use newer Element methods now (1.5.2).

  cumulativeOffset: Element.Methods.cumulativeOffset,

  positionedOffset: Element.Methods.positionedOffset,

  absolutize: function(element) {
    Position.prepare();
    return Element.absolutize(element);
  },

  relativize: function(element) {
    Position.prepare();
    return Element.relativize(element);
  },

  realOffset: Element.Methods.cumulativeScrollOffset,

  offsetParent: Element.Methods.getOffsetParent,

  page: Element.Methods.viewportOffset,

  clone: function(source, target, options) {
    options = options || { };
    return Element.clonePosition(target, source, options);
  }
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
  function iter(name) {
    return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
  }

  instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  function(element, className) {
    className = className.toString().strip();
    var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
    return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  } : function(element, className) {
    className = className.toString().strip();
    var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
    if (!classNames && !className) return elements;

    var nodes = $(element).getElementsByTagName('*');
    className = ' ' + className + ' ';

    for (var i = 0, child, cn; child = nodes[i]; i++) {
      if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
          (classNames && classNames.all(function(name) {
            return !name.toString().blank() && cn.include(' ' + name + ' ');
          }))))
        elements.push(Element.extend(child));
    }
    return elements;
  };

  return function(className, parentElement) {
    return $(parentElement || document.body).getElementsByClassName(className);
  };
}(Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
  initialize: function(element) {
    this.element = $(element);
  },

  _each: function(iterator) {
    this.element.className.split(/\s+/).select(function(name) {
      return name.length > 0;
    })._each(iterator);
  },

  set: function(className) {
    this.element.className = className;
  },

  add: function(classNameToAdd) {
    if (this.include(classNameToAdd)) return;
    this.set($A(this).concat(classNameToAdd).join(' '));
  },

  remove: function(classNameToRemove) {
    if (!this.include(classNameToRemove)) return;
    this.set($A(this).without(classNameToRemove).join(' '));
  },

  toString: function() {
    return $A(this).join(' ');
  }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

Element.addMethods();

// Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
// Contributors:
//  Justin Palmer (http://encytemedia.com/)
//  Mark Pilgrim (http://diveintomark.org/)
//  Martin Bialasinki
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

// converts rgb() and #xxx to #xxxxxx format,
// returns self (or first argument) if not convertable
String.prototype.parseColor = function() {
  var color = '#';
  if (this.slice(0,4) == 'rgb(') {
    var cols = this.slice(4,this.length-1).split(',');
    var i=0; do { color += parseInt(cols[i]).toColorPart() } while (++i<3);
  } else {
    if (this.slice(0,1) == '#') {
      if (this.length==4) for(var i=1;i<4;i++) color += (this.charAt(i) + this.charAt(i)).toLowerCase();
      if (this.length==7) color = this.toLowerCase();
    }
  }
  return (color.length==7 ? color : (arguments[0] || this));
};

/*--------------------------------------------------------------------------*/

Element.collectTextNodes = function(element) {
  return $A($(element).childNodes).collect( function(node) {
    return (node.nodeType==3 ? node.nodeValue :
      (node.hasChildNodes() ? Element.collectTextNodes(node) : ''));
  }).flatten().join('');
};

Element.collectTextNodesIgnoreClass = function(element, className) {
  return $A($(element).childNodes).collect( function(node) {
    return (node.nodeType==3 ? node.nodeValue :
      ((node.hasChildNodes() && !Element.hasClassName(node,className)) ?
        Element.collectTextNodesIgnoreClass(node, className) : ''));
  }).flatten().join('');
};

Element.setContentZoom = function(element, percent) {
  element = $(element);
  element.setStyle({fontSize: (percent/100) + 'em'});
  if (Prototype.Browser.WebKit) window.scrollBy(0,0);
  return element;
};

Element.getInlineOpacity = function(element){
  return $(element).style.opacity || '';
};

Element.forceRerendering = function(element) {
  try {
    element = $(element);
    var n = document.createTextNode(' ');
    element.appendChild(n);
    element.removeChild(n);
  } catch(e) { }
};

/*--------------------------------------------------------------------------*/

var Effect = {
  _elementDoesNotExistError: {
    name: 'ElementDoesNotExistError',
    message: 'The specified DOM element does not exist, but is required for this effect to operate'
  },
  Transitions: {
    linear: Prototype.K,
    sinoidal: function(pos) {
      return (-Math.cos(pos*Math.PI)/2) + .5;
    },
    reverse: function(pos) {
      return 1-pos;
    },
    flicker: function(pos) {
      var pos = ((-Math.cos(pos*Math.PI)/4) + .75) + Math.random()/4;
      return pos > 1 ? 1 : pos;
    },
    wobble: function(pos) {
      return (-Math.cos(pos*Math.PI*(9*pos))/2) + .5;
    },
    pulse: function(pos, pulses) {
      return (-Math.cos((pos*((pulses||5)-.5)*2)*Math.PI)/2) + .5;
    },
    spring: function(pos) {
      return 1 - (Math.cos(pos * 4.5 * Math.PI) * Math.exp(-pos * 6));
    },
    none: function(pos) {
      return 0;
    },
    full: function(pos) {
      return 1;
    }
  },
  DefaultOptions: {
    duration:   1.0,   // seconds
    fps:        100,   // 100= assume 66fps max.
    sync:       false, // true for combining
    from:       0.0,
    to:         1.0,
    delay:      0.0,
    queue:      'parallel'
  },
  tagifyText: function(element) {
    var tagifyStyle = 'position:relative';
    if (Prototype.Browser.IE) tagifyStyle += ';zoom:1';

    element = $(element);
    $A(element.childNodes).each( function(child) {
      if (child.nodeType==3) {
        child.nodeValue.toArray().each( function(character) {
          element.insertBefore(
            new Element('span', {style: tagifyStyle}).update(
              character == ' ' ? String.fromCharCode(160) : character),
              child);
        });
        Element.remove(child);
      }
    });
  },
  multiple: function(element, effect) {
    var elements;
    if (((typeof element == 'object') ||
        Object.isFunction(element)) &&
       (element.length))
      elements = element;
    else
      elements = $(element).childNodes;

    var options = Object.extend({
      speed: 0.1,
      delay: 0.0
    }, arguments[2] || { });
    var masterDelay = options.delay;

    $A(elements).each( function(element, index) {
      new effect(element, Object.extend(options, { delay: index * options.speed + masterDelay }));
    });
  },
  PAIRS: {
    'slide':  ['SlideDown','SlideUp'],
    'blind':  ['BlindDown','BlindUp'],
    'appear': ['Appear','Fade']
  },
  toggle: function(element, effect) {
    element = $(element);
    effect = (effect || 'appear').toLowerCase();
    var options = Object.extend({
      queue: { position:'end', scope:(element.id || 'global'), limit: 1 }
    }, arguments[2] || { });
    Effect[element.visible() ?
      Effect.PAIRS[effect][1] : Effect.PAIRS[effect][0]](element, options);
  }
};

Effect.DefaultOptions.transition = Effect.Transitions.sinoidal;

/* ------------- core effects ------------- */

Effect.ScopedQueue = Class.create(Enumerable, {
  initialize: function() {
    this.effects  = [];
    this.interval = null;
  },
  _each: function(iterator) {
    this.effects._each(iterator);
  },
  add: function(effect) {
    var timestamp = new Date().getTime();

    var position = Object.isString(effect.options.queue) ?
      effect.options.queue : effect.options.queue.position;

    switch(position) {
      case 'front':
        // move unstarted effects after this effect
        this.effects.findAll(function(e){ return e.state=='idle' }).each( function(e) {
            e.startOn  += effect.finishOn;
            e.finishOn += effect.finishOn;
          });
        break;
      case 'with-last':
        timestamp = this.effects.pluck('startOn').max() || timestamp;
        break;
      case 'end':
        // start effect after last queued effect has finished
        timestamp = this.effects.pluck('finishOn').max() || timestamp;
        break;
    }

    effect.startOn  += timestamp;
    effect.finishOn += timestamp;

    if (!effect.options.queue.limit || (this.effects.length < effect.options.queue.limit))
      this.effects.push(effect);

    if (!this.interval)
      this.interval = setInterval(this.loop.bind(this), 15);
  },
  remove: function(effect) {
    this.effects = this.effects.reject(function(e) { return e==effect });
    if (this.effects.length == 0) {
      clearInterval(this.interval);
      this.interval = null;
    }
  },
  loop: function() {
    var timePos = new Date().getTime();
    for(var i=0, len=this.effects.length;i<len;i++)
      this.effects[i] && this.effects[i].loop(timePos);
  }
});

Effect.Queues = {
  instances: $H(),
  get: function(queueName) {
    if (!Object.isString(queueName)) return queueName;

    return this.instances.get(queueName) ||
      this.instances.set(queueName, new Effect.ScopedQueue());
  }
};
Effect.Queue = Effect.Queues.get('global');

Effect.Base = Class.create({
  position: null,
  start: function(options) {
    function codeForEvent(options,eventName){
      return (
        (options[eventName+'Internal'] ? 'this.options.'+eventName+'Internal(this);' : '') +
        (options[eventName] ? 'this.options.'+eventName+'(this);' : '')
      );
    }
    if (options && options.transition === false) options.transition = Effect.Transitions.linear;
    this.options      = Object.extend(Object.extend({ },Effect.DefaultOptions), options || { });
    this.currentFrame = 0;
    this.state        = 'idle';
    this.startOn      = this.options.delay*1000;
    this.finishOn     = this.startOn+(this.options.duration*1000);
    this.fromToDelta  = this.options.to-this.options.from;
    this.totalTime    = this.finishOn-this.startOn;
    this.totalFrames  = this.options.fps*this.options.duration;

    this.render = (function() {
      function dispatch(effect, eventName) {
        if (effect.options[eventName + 'Internal'])
          effect.options[eventName + 'Internal'](effect);
        if (effect.options[eventName])
          effect.options[eventName](effect);
      }

      return function(pos) {
        if (this.state === "idle") {
          this.state = "running";
          dispatch(this, 'beforeSetup');
          if (this.setup) this.setup();
          dispatch(this, 'afterSetup');
        }
        if (this.state === "running") {
          pos = (this.options.transition(pos) * this.fromToDelta) + this.options.from;
          this.position = pos;
          dispatch(this, 'beforeUpdate');
          if (this.update) this.update(pos);
          dispatch(this, 'afterUpdate');
        }
      };
    })();

    this.event('beforeStart');
    if (!this.options.sync)
      Effect.Queues.get(Object.isString(this.options.queue) ?
        'global' : this.options.queue.scope).add(this);
  },
  loop: function(timePos) {
    if (timePos >= this.startOn) {
      if (timePos >= this.finishOn) {
        this.render(1.0);
        this.cancel();
        this.event('beforeFinish');
        if (this.finish) this.finish();
        this.event('afterFinish');
        return;
      }
      var pos   = (timePos - this.startOn) / this.totalTime,
          frame = (pos * this.totalFrames).round();
      if (frame > this.currentFrame) {
        this.render(pos);
        this.currentFrame = frame;
      }
    }
  },
  cancel: function() {
    if (!this.options.sync)
      Effect.Queues.get(Object.isString(this.options.queue) ?
        'global' : this.options.queue.scope).remove(this);
    this.state = 'finished';
  },
  event: function(eventName) {
    if (this.options[eventName + 'Internal']) this.options[eventName + 'Internal'](this);
    if (this.options[eventName]) this.options[eventName](this);
  },
  inspect: function() {
    var data = $H();
    for(property in this)
      if (!Object.isFunction(this[property])) data.set(property, this[property]);
    return '#<Effect:' + data.inspect() + ',options:' + $H(this.options).inspect() + '>';
  }
});

Effect.Parallel = Class.create(Effect.Base, {
  initialize: function(effects) {
    this.effects = effects || [];
    this.start(arguments[1]);
  },
  update: function(position) {
    this.effects.invoke('render', position);
  },
  finish: function(position) {
    this.effects.each( function(effect) {
      effect.render(1.0);
      effect.cancel();
      effect.event('beforeFinish');
      if (effect.finish) effect.finish(position);
      effect.event('afterFinish');
    });
  }
});

Effect.Tween = Class.create(Effect.Base, {
  initialize: function(object, from, to) {
    object = Object.isString(object) ? $(object) : object;
    var args = $A(arguments), method = args.last(),
      options = args.length == 5 ? args[3] : null;
    this.method = Object.isFunction(method) ? method.bind(object) :
      Object.isFunction(object[method]) ? object[method].bind(object) :
      function(value) { object[method] = value };
    this.start(Object.extend({ from: from, to: to }, options || { }));
  },
  update: function(position) {
    this.method(position);
  }
});

Effect.Event = Class.create(Effect.Base, {
  initialize: function() {
    this.start(Object.extend({ duration: 0 }, arguments[0] || { }));
  },
  update: Prototype.emptyFunction
});

Effect.Opacity = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    // make this work on IE on elements without 'layout'
    if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
      this.element.setStyle({zoom: 1});
    var options = Object.extend({
      from: this.element.getOpacity() || 0.0,
      to:   1.0
    }, arguments[1] || { });
    this.start(options);
  },
  update: function(position) {
    this.element.setOpacity(position);
  }
});

Effect.Move = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      x:    0,
      y:    0,
      mode: 'relative'
    }, arguments[1] || { });
    this.start(options);
  },
  setup: function() {
    this.element.makePositioned();
    this.originalLeft = parseFloat(this.element.getStyle('left') || '0');
    this.originalTop  = parseFloat(this.element.getStyle('top')  || '0');
    if (this.options.mode == 'absolute') {
      this.options.x = this.options.x - this.originalLeft;
      this.options.y = this.options.y - this.originalTop;
    }
  },
  update: function(position) {
    this.element.setStyle({
      left: (this.options.x  * position + this.originalLeft).round() + 'px',
      top:  (this.options.y  * position + this.originalTop).round()  + 'px'
    });
  }
});

// for backwards compatibility
Effect.MoveBy = function(element, toTop, toLeft) {
  return new Effect.Move(element,
    Object.extend({ x: toLeft, y: toTop }, arguments[3] || { }));
};

Effect.Scale = Class.create(Effect.Base, {
  initialize: function(element, percent) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      scaleX: true,
      scaleY: true,
      scaleContent: true,
      scaleFromCenter: false,
      scaleMode: 'box',        // 'box' or 'contents' or { } with provided values
      scaleFrom: 100.0,
      scaleTo:   percent
    }, arguments[2] || { });
    this.start(options);
  },
  setup: function() {
    this.restoreAfterFinish = this.options.restoreAfterFinish || false;
    this.elementPositioning = this.element.getStyle('position');

    this.originalStyle = { };
    ['top','left','width','height','fontSize'].each( function(k) {
      this.originalStyle[k] = this.element.style[k];
    }.bind(this));

    this.originalTop  = this.element.offsetTop;
    this.originalLeft = this.element.offsetLeft;

    var fontSize = this.element.getStyle('font-size') || '100%';
    ['em','px','%','pt'].each( function(fontSizeType) {
      if (fontSize.indexOf(fontSizeType)>0) {
        this.fontSize     = parseFloat(fontSize);
        this.fontSizeType = fontSizeType;
      }
    }.bind(this));

    this.factor = (this.options.scaleTo - this.options.scaleFrom)/100;

    this.dims = null;
    if (this.options.scaleMode=='box')
      this.dims = [this.element.offsetHeight, this.element.offsetWidth];
    if (/^content/.test(this.options.scaleMode))
      this.dims = [this.element.scrollHeight, this.element.scrollWidth];
    if (!this.dims)
      this.dims = [this.options.scaleMode.originalHeight,
                   this.options.scaleMode.originalWidth];
  },
  update: function(position) {
    var currentScale = (this.options.scaleFrom/100.0) + (this.factor * position);
    if (this.options.scaleContent && this.fontSize)
      this.element.setStyle({fontSize: this.fontSize * currentScale + this.fontSizeType });
    this.setDimensions(this.dims[0] * currentScale, this.dims[1] * currentScale);
  },
  finish: function(position) {
    if (this.restoreAfterFinish) this.element.setStyle(this.originalStyle);
  },
  setDimensions: function(height, width) {
    var d = { };
    if (this.options.scaleX) d.width = width.round() + 'px';
    if (this.options.scaleY) d.height = height.round() + 'px';
    if (this.options.scaleFromCenter) {
      var topd  = (height - this.dims[0])/2;
      var leftd = (width  - this.dims[1])/2;
      if (this.elementPositioning == 'absolute') {
        if (this.options.scaleY) d.top = this.originalTop-topd + 'px';
        if (this.options.scaleX) d.left = this.originalLeft-leftd + 'px';
      } else {
        if (this.options.scaleY) d.top = -topd + 'px';
        if (this.options.scaleX) d.left = -leftd + 'px';
      }
    }
    this.element.setStyle(d);
  }
});

Effect.Highlight = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({ startcolor: '#ffff99' }, arguments[1] || { });
    this.start(options);
  },
  setup: function() {
    // Prevent executing on elements not in the layout flow
    if (this.element.getStyle('display')=='none') { this.cancel(); return; }
    // Disable background image during the effect
    this.oldStyle = { };
    if (!this.options.keepBackgroundImage) {
      this.oldStyle.backgroundImage = this.element.getStyle('background-image');
      this.element.setStyle({backgroundImage: 'none'});
    }
    if (!this.options.endcolor)
      this.options.endcolor = this.element.getStyle('background-color').parseColor('#ffffff');
    if (!this.options.restorecolor)
      this.options.restorecolor = this.element.getStyle('background-color');
    // init color calculations
    this._base  = $R(0,2).map(function(i){ return parseInt(this.options.startcolor.slice(i*2+1,i*2+3),16) }.bind(this));
    this._delta = $R(0,2).map(function(i){ return parseInt(this.options.endcolor.slice(i*2+1,i*2+3),16)-this._base[i] }.bind(this));
  },
  update: function(position) {
    this.element.setStyle({backgroundColor: $R(0,2).inject('#',function(m,v,i){
      return m+((this._base[i]+(this._delta[i]*position)).round().toColorPart()); }.bind(this)) });
  },
  finish: function() {
    this.element.setStyle(Object.extend(this.oldStyle, {
      backgroundColor: this.options.restorecolor
    }));
  }
});

Effect.ScrollTo = function(element) {
  var options = arguments[1] || { },
  scrollOffsets = document.viewport.getScrollOffsets(),
  elementOffsets = $(element).cumulativeOffset();

  if (options.offset) elementOffsets[1] += options.offset;

  return new Effect.Tween(null,
    scrollOffsets.top,
    elementOffsets[1],
    options,
    function(p){ scrollTo(scrollOffsets.left, p.round()); }
  );
};

/* ------------- combination effects ------------- */

Effect.Fade = function(element) {
  element = $(element);
  var oldOpacity = element.getInlineOpacity();
  var options = Object.extend({
    from: element.getOpacity() || 1.0,
    to:   0.0,
    afterFinishInternal: function(effect) {
      if (effect.options.to!=0) return;
      effect.element.hide().setStyle({opacity: oldOpacity});
    }
  }, arguments[1] || { });
  return new Effect.Opacity(element,options);
};

Effect.Appear = function(element) {
  element = $(element);
  var options = Object.extend({
  from: (element.getStyle('display') == 'none' ? 0.0 : element.getOpacity() || 0.0),
  to:   1.0,
  // force Safari to render floated elements properly
  afterFinishInternal: function(effect) {
    effect.element.forceRerendering();
  },
  beforeSetup: function(effect) {
    effect.element.setOpacity(effect.options.from).show();
  }}, arguments[1] || { });
  return new Effect.Opacity(element,options);
};

Effect.Puff = function(element) {
  element = $(element);
  var oldStyle = {
    opacity: element.getInlineOpacity(),
    position: element.getStyle('position'),
    top:  element.style.top,
    left: element.style.left,
    width: element.style.width,
    height: element.style.height
  };
  return new Effect.Parallel(
   [ new Effect.Scale(element, 200,
      { sync: true, scaleFromCenter: true, scaleContent: true, restoreAfterFinish: true }),
     new Effect.Opacity(element, { sync: true, to: 0.0 } ) ],
     Object.extend({ duration: 1.0,
      beforeSetupInternal: function(effect) {
        Position.absolutize(effect.effects[0].element);
      },
      afterFinishInternal: function(effect) {
         effect.effects[0].element.hide().setStyle(oldStyle); }
     }, arguments[1] || { })
   );
};

Effect.BlindUp = function(element) {
  element = $(element);
  element.makeClipping();
  return new Effect.Scale(element, 0,
    Object.extend({ scaleContent: false,
      scaleX: false,
      restoreAfterFinish: true,
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping();
      }
    }, arguments[1] || { })
  );
};

Effect.BlindDown = function(element) {
  element = $(element);
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, 100, Object.extend({
    scaleContent: false,
    scaleX: false,
    scaleFrom: 0,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makeClipping().setStyle({height: '0px'}).show();
    },
    afterFinishInternal: function(effect) {
      effect.element.undoClipping();
    }
  }, arguments[1] || { }));
};

Effect.SwitchOff = function(element) {
  element = $(element);
  var oldOpacity = element.getInlineOpacity();
  return new Effect.Appear(element, Object.extend({
    duration: 0.4,
    from: 0,
    transition: Effect.Transitions.flicker,
    afterFinishInternal: function(effect) {
      new Effect.Scale(effect.element, 1, {
        duration: 0.3, scaleFromCenter: true,
        scaleX: false, scaleContent: false, restoreAfterFinish: true,
        beforeSetup: function(effect) {
          effect.element.makePositioned().makeClipping();
        },
        afterFinishInternal: function(effect) {
          effect.element.hide().undoClipping().undoPositioned().setStyle({opacity: oldOpacity});
        }
      });
    }
  }, arguments[1] || { }));
};

Effect.DropOut = function(element) {
  element = $(element);
  var oldStyle = {
    top: element.getStyle('top'),
    left: element.getStyle('left'),
    opacity: element.getInlineOpacity() };
  return new Effect.Parallel(
    [ new Effect.Move(element, {x: 0, y: 100, sync: true }),
      new Effect.Opacity(element, { sync: true, to: 0.0 }) ],
    Object.extend(
      { duration: 0.5,
        beforeSetup: function(effect) {
          effect.effects[0].element.makePositioned();
        },
        afterFinishInternal: function(effect) {
          effect.effects[0].element.hide().undoPositioned().setStyle(oldStyle);
        }
      }, arguments[1] || { }));
};

Effect.Shake = function(element) {
  element = $(element);
  var options = Object.extend({
    distance: 20,
    duration: 0.5
  }, arguments[1] || {});
  var distance = parseFloat(options.distance);
  var split = parseFloat(options.duration) / 10.0;
  var oldStyle = {
    top: element.getStyle('top'),
    left: element.getStyle('left') };
    return new Effect.Move(element,
      { x:  distance, y: 0, duration: split, afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x:  distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x:  distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance, y: 0, duration: split, afterFinishInternal: function(effect) {
        effect.element.undoPositioned().setStyle(oldStyle);
  }}); }}); }}); }}); }}); }});
};

Effect.SlideDown = function(element) {
  element = $(element).cleanWhitespace();
  // SlideDown need to have the content of the element wrapped in a container element with fixed height!
  var oldInnerBottom = element.down().getStyle('bottom');
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, 100, Object.extend({
    scaleContent: false,
    scaleX: false,
    scaleFrom: window.opera ? 0 : 1,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makePositioned();
      effect.element.down().makePositioned();
      if (window.opera) effect.element.setStyle({top: ''});
      effect.element.makeClipping().setStyle({height: '0px'}).show();
    },
    afterUpdateInternal: function(effect) {
      effect.element.down().setStyle({bottom:
        (effect.dims[0] - effect.element.clientHeight) + 'px' });
    },
    afterFinishInternal: function(effect) {
      effect.element.undoClipping().undoPositioned();
      effect.element.down().undoPositioned().setStyle({bottom: oldInnerBottom}); }
    }, arguments[1] || { })
  );
};

Effect.SlideUp = function(element) {
  element = $(element).cleanWhitespace();
  var oldInnerBottom = element.down().getStyle('bottom');
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, window.opera ? 0 : 1,
   Object.extend({ scaleContent: false,
    scaleX: false,
    scaleMode: 'box',
    scaleFrom: 100,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makePositioned();
      effect.element.down().makePositioned();
      if (window.opera) effect.element.setStyle({top: ''});
      effect.element.makeClipping().show();
    },
    afterUpdateInternal: function(effect) {
      effect.element.down().setStyle({bottom:
        (effect.dims[0] - effect.element.clientHeight) + 'px' });
    },
    afterFinishInternal: function(effect) {
      effect.element.hide().undoClipping().undoPositioned();
      effect.element.down().undoPositioned().setStyle({bottom: oldInnerBottom});
    }
   }, arguments[1] || { })
  );
};

// Bug in opera makes the TD containing this element expand for a instance after finish
Effect.Squish = function(element) {
  return new Effect.Scale(element, window.opera ? 1 : 0, {
    restoreAfterFinish: true,
    beforeSetup: function(effect) {
      effect.element.makeClipping();
    },
    afterFinishInternal: function(effect) {
      effect.element.hide().undoClipping();
    }
  });
};

Effect.Grow = function(element) {
  element = $(element);
  var options = Object.extend({
    direction: 'center',
    moveTransition: Effect.Transitions.sinoidal,
    scaleTransition: Effect.Transitions.sinoidal,
    opacityTransition: Effect.Transitions.full
  }, arguments[1] || { });
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    height: element.style.height,
    width: element.style.width,
    opacity: element.getInlineOpacity() };

  var dims = element.getDimensions();
  var initialMoveX, initialMoveY;
  var moveX, moveY;

  switch (options.direction) {
    case 'top-left':
      initialMoveX = initialMoveY = moveX = moveY = 0;
      break;
    case 'top-right':
      initialMoveX = dims.width;
      initialMoveY = moveY = 0;
      moveX = -dims.width;
      break;
    case 'bottom-left':
      initialMoveX = moveX = 0;
      initialMoveY = dims.height;
      moveY = -dims.height;
      break;
    case 'bottom-right':
      initialMoveX = dims.width;
      initialMoveY = dims.height;
      moveX = -dims.width;
      moveY = -dims.height;
      break;
    case 'center':
      initialMoveX = dims.width / 2;
      initialMoveY = dims.height / 2;
      moveX = -dims.width / 2;
      moveY = -dims.height / 2;
      break;
  }

  return new Effect.Move(element, {
    x: initialMoveX,
    y: initialMoveY,
    duration: 0.01,
    beforeSetup: function(effect) {
      effect.element.hide().makeClipping().makePositioned();
    },
    afterFinishInternal: function(effect) {
      new Effect.Parallel(
        [ new Effect.Opacity(effect.element, { sync: true, to: 1.0, from: 0.0, transition: options.opacityTransition }),
          new Effect.Move(effect.element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition }),
          new Effect.Scale(effect.element, 100, {
            scaleMode: { originalHeight: dims.height, originalWidth: dims.width },
            sync: true, scaleFrom: window.opera ? 1 : 0, transition: options.scaleTransition, restoreAfterFinish: true})
        ], Object.extend({
             beforeSetup: function(effect) {
               effect.effects[0].element.setStyle({height: '0px'}).show();
             },
             afterFinishInternal: function(effect) {
               effect.effects[0].element.undoClipping().undoPositioned().setStyle(oldStyle);
             }
           }, options)
      );
    }
  });
};

Effect.Shrink = function(element) {
  element = $(element);
  var options = Object.extend({
    direction: 'center',
    moveTransition: Effect.Transitions.sinoidal,
    scaleTransition: Effect.Transitions.sinoidal,
    opacityTransition: Effect.Transitions.none
  }, arguments[1] || { });
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    height: element.style.height,
    width: element.style.width,
    opacity: element.getInlineOpacity() };

  var dims = element.getDimensions();
  var moveX, moveY;

  switch (options.direction) {
    case 'top-left':
      moveX = moveY = 0;
      break;
    case 'top-right':
      moveX = dims.width;
      moveY = 0;
      break;
    case 'bottom-left':
      moveX = 0;
      moveY = dims.height;
      break;
    case 'bottom-right':
      moveX = dims.width;
      moveY = dims.height;
      break;
    case 'center':
      moveX = dims.width / 2;
      moveY = dims.height / 2;
      break;
  }

  return new Effect.Parallel(
    [ new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0, transition: options.opacityTransition }),
      new Effect.Scale(element, window.opera ? 1 : 0, { sync: true, transition: options.scaleTransition, restoreAfterFinish: true}),
      new Effect.Move(element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition })
    ], Object.extend({
         beforeStartInternal: function(effect) {
           effect.effects[0].element.makePositioned().makeClipping();
         },
         afterFinishInternal: function(effect) {
           effect.effects[0].element.hide().undoClipping().undoPositioned().setStyle(oldStyle); }
       }, options)
  );
};

Effect.Pulsate = function(element) {
  element = $(element);
  var options    = arguments[1] || { },
    oldOpacity = element.getInlineOpacity(),
    transition = options.transition || Effect.Transitions.linear,
    reverser   = function(pos){
      return 1 - transition((-Math.cos((pos*(options.pulses||5)*2)*Math.PI)/2) + .5);
    };

  return new Effect.Opacity(element,
    Object.extend(Object.extend({  duration: 2.0, from: 0,
      afterFinishInternal: function(effect) { effect.element.setStyle({opacity: oldOpacity}); }
    }, options), {transition: reverser}));
};

Effect.Fold = function(element) {
  element = $(element);
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    width: element.style.width,
    height: element.style.height };
  element.makeClipping();
  return new Effect.Scale(element, 5, Object.extend({
    scaleContent: false,
    scaleX: false,
    afterFinishInternal: function(effect) {
    new Effect.Scale(element, 1, {
      scaleContent: false,
      scaleY: false,
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping().setStyle(oldStyle);
      } });
  }}, arguments[1] || { }));
};

Effect.Morph = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      style: { }
    }, arguments[1] || { });

    if (!Object.isString(options.style)) this.style = $H(options.style);
    else {
      if (options.style.include(':'))
        this.style = options.style.parseStyle();
      else {
        this.element.addClassName(options.style);
        this.style = $H(this.element.getStyles());
        this.element.removeClassName(options.style);
        var css = this.element.getStyles();
        this.style = this.style.reject(function(style) {
          return style.value == css[style.key];
        });
        options.afterFinishInternal = function(effect) {
          effect.element.addClassName(effect.options.style);
          effect.transforms.each(function(transform) {
            effect.element.style[transform.style] = '';
          });
        };
      }
    }
    this.start(options);
  },

  setup: function(){
    function parseColor(color){
      if (!color || ['rgba(0, 0, 0, 0)','transparent'].include(color)) color = '#ffffff';
      color = color.parseColor();
      return $R(0,2).map(function(i){
        return parseInt( color.slice(i*2+1,i*2+3), 16 );
      });
    }
    this.transforms = this.style.map(function(pair){
      var property = pair[0], value = pair[1], unit = null;

      if (value.parseColor('#zzzzzz') != '#zzzzzz') {
        value = value.parseColor();
        unit  = 'color';
      } else if (property == 'opacity') {
        value = parseFloat(value);
        if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
          this.element.setStyle({zoom: 1});
      } else if (Element.CSS_LENGTH.test(value)) {
          var components = value.match(/^([\+\-]?[0-9\.]+)(.*)$/);
          value = parseFloat(components[1]);
          unit = (components.length == 3) ? components[2] : null;
      }

      var originalValue = this.element.getStyle(property);
      return {
        style: property.camelize(),
        originalValue: unit=='color' ? parseColor(originalValue) : parseFloat(originalValue || 0),
        targetValue: unit=='color' ? parseColor(value) : value,
        unit: unit
      };
    }.bind(this)).reject(function(transform){
      return (
        (transform.originalValue == transform.targetValue) ||
        (
          transform.unit != 'color' &&
          (isNaN(transform.originalValue) || isNaN(transform.targetValue))
        )
      );
    });
  },
  update: function(position) {
    var style = { }, transform, i = this.transforms.length;
    while(i--)
      style[(transform = this.transforms[i]).style] =
        transform.unit=='color' ? '#'+
          (Math.round(transform.originalValue[0]+
            (transform.targetValue[0]-transform.originalValue[0])*position)).toColorPart() +
          (Math.round(transform.originalValue[1]+
            (transform.targetValue[1]-transform.originalValue[1])*position)).toColorPart() +
          (Math.round(transform.originalValue[2]+
            (transform.targetValue[2]-transform.originalValue[2])*position)).toColorPart() :
        (transform.originalValue +
          (transform.targetValue - transform.originalValue) * position).toFixed(3) +
            (transform.unit === null ? '' : transform.unit);
    this.element.setStyle(style, true);
  }
});

Effect.Transform = Class.create({
  initialize: function(tracks){
    this.tracks  = [];
    this.options = arguments[1] || { };
    this.addTracks(tracks);
  },
  addTracks: function(tracks){
    tracks.each(function(track){
      track = $H(track);
      var data = track.values().first();
      this.tracks.push($H({
        ids:     track.keys().first(),
        effect:  Effect.Morph,
        options: { style: data }
      }));
    }.bind(this));
    return this;
  },
  play: function(){
    return new Effect.Parallel(
      this.tracks.map(function(track){
        var ids = track.get('ids'), effect = track.get('effect'), options = track.get('options');
        var elements = [$(ids) || $$(ids)].flatten();
        return elements.map(function(e){ return new effect(e, Object.extend({ sync:true }, options)) });
      }).flatten(),
      this.options
    );
  }
});

Element.CSS_PROPERTIES = $w(
  'backgroundColor backgroundPosition borderBottomColor borderBottomStyle ' +
  'borderBottomWidth borderLeftColor borderLeftStyle borderLeftWidth ' +
  'borderRightColor borderRightStyle borderRightWidth borderSpacing ' +
  'borderTopColor borderTopStyle borderTopWidth bottom clip color ' +
  'fontSize fontWeight height left letterSpacing lineHeight ' +
  'marginBottom marginLeft marginRight marginTop markerOffset maxHeight '+
  'maxWidth minHeight minWidth opacity outlineColor outlineOffset ' +
  'outlineWidth paddingBottom paddingLeft paddingRight paddingTop ' +
  'right textIndent top width wordSpacing zIndex');

Element.CSS_LENGTH = /^(([\+\-]?[0-9\.]+)(em|ex|px|in|cm|mm|pt|pc|\%))|0$/;

String.__parseStyleElement = document.createElement('div');
String.prototype.parseStyle = function(){
  var style, styleRules = $H();
  if (Prototype.Browser.WebKit)
    style = new Element('div',{style:this}).style;
  else {
    String.__parseStyleElement.innerHTML = '<div style="' + this + '"></div>';
    style = String.__parseStyleElement.childNodes[0].style;
  }

  Element.CSS_PROPERTIES.each(function(property){
    if (style[property]) styleRules.set(property, style[property]);
  });

  if (Prototype.Browser.IE && this.include('opacity'))
    styleRules.set('opacity', this.match(/opacity:\s*((?:0|1)?(?:\.\d*)?)/)[1]);

  return styleRules;
};

if (document.defaultView && document.defaultView.getComputedStyle) {
  Element.getStyles = function(element) {
    var css = document.defaultView.getComputedStyle($(element), null);
    return Element.CSS_PROPERTIES.inject({ }, function(styles, property) {
      styles[property] = css[property];
      return styles;
    });
  };
} else {
  Element.getStyles = function(element) {
    element = $(element);
    var css = element.currentStyle, styles;
    styles = Element.CSS_PROPERTIES.inject({ }, function(results, property) {
      results[property] = css[property];
      return results;
    });
    if (!styles.opacity) styles.opacity = element.getOpacity();
    return styles;
  };
}

Effect.Methods = {
  morph: function(element, style) {
    element = $(element);
    new Effect.Morph(element, Object.extend({ style: style }, arguments[2] || { }));
    return element;
  },
  visualEffect: function(element, effect, options) {
    element = $(element);
    var s = effect.dasherize().camelize(), klass = s.charAt(0).toUpperCase() + s.substring(1);
    new Effect[klass](element, options);
    return element;
  },
  highlight: function(element, options) {
    element = $(element);
    new Effect.Highlight(element, options);
    return element;
  }
};

$w('fade appear grow shrink fold blindUp blindDown slideUp slideDown '+
  'pulsate shake puff squish switchOff dropOut').each(
  function(effect) {
    Effect.Methods[effect] = function(element, options){
      element = $(element);
      Effect[effect.charAt(0).toUpperCase() + effect.substring(1)](element, options);
      return element;
    };
  }
);

$w('getInlineOpacity forceRerendering setContentZoom collectTextNodes collectTextNodesIgnoreClass getStyles').each(
  function(f) { Effect.Methods[f] = Element[f]; }
);

Element.addMethods(Effect.Methods);

// Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//           (c) 2005-2008 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

if(Object.isUndefined(Effect))
  throw("dragdrop.js requires including script.aculo.us' effects.js library");

var Droppables = {
  drops: [],

  remove: function(element) {
    this.drops = this.drops.reject(function(d) { return d.element==$(element) });
  },

  add: function(element) {
    element = $(element);
    var options = Object.extend({
      greedy:     true,
      hoverclass: null,
      tree:       false
    }, arguments[1] || { });

    // cache containers
    if(options.containment) {
      options._containers = [];
      var containment = options.containment;
      if(Object.isArray(containment)) {
        containment.each( function(c) { options._containers.push($(c)) });
      } else {
        options._containers.push($(containment));
      }
    }

    if(options.accept) options.accept = [options.accept].flatten();

    Element.makePositioned(element); // fix IE
    options.element = element;

    this.drops.push(options);
  },

  findDeepestChild: function(drops) {
    deepest = drops[0];

    for (i = 1; i < drops.length; ++i)
      if (Element.isParent(drops[i].element, deepest.element))
        deepest = drops[i];

    return deepest;
  },

  isContained: function(element, drop) {
    var containmentNode;
    if(drop.tree) {
      containmentNode = element.treeNode;
    } else {
      containmentNode = element.parentNode;
    }
    return drop._containers.detect(function(c) { return containmentNode == c });
  },

  isAffected: function(point, element, drop) {
    return (
      (drop.element!=element) &&
      ((!drop._containers) ||
        this.isContained(element, drop)) &&
      ((!drop.accept) ||
        (Element.classNames(element).detect(
          function(v) { return drop.accept.include(v) } ) )) &&
      Position.within(drop.element, point[0], point[1]) );
  },

  deactivate: function(drop) {
    if(drop.hoverclass)
      Element.removeClassName(drop.element, drop.hoverclass);
    this.last_active = null;
  },

  activate: function(drop) {
    if(drop.hoverclass)
      Element.addClassName(drop.element, drop.hoverclass);
    this.last_active = drop;
  },

  show: function(point, element) {
    if(!this.drops.length) return;
    var drop, affected = [];

    this.drops.each( function(drop) {
      if(Droppables.isAffected(point, element, drop))
        affected.push(drop);
    });

    if(affected.length>0)
      drop = Droppables.findDeepestChild(affected);

    if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);
    if (drop) {
      Position.within(drop.element, point[0], point[1]);
      if(drop.onHover)
        drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));

      if (drop != this.last_active) Droppables.activate(drop);
    }
  },

  fire: function(event, element) {
    if(!this.last_active) return;
    Position.prepare();

    if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
      if (this.last_active.onDrop) {
        this.last_active.onDrop(element, this.last_active.element, event);
        return true;
      }
  },

  reset: function() {
    if(this.last_active)
      this.deactivate(this.last_active);
  }
};

var Draggables = {
  drags: [],
  observers: [],

  register: function(draggable) {
    if(this.drags.length == 0) {
      this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
      this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
      this.eventKeypress  = this.keyPress.bindAsEventListener(this);

      Event.observe(document, "mouseup", this.eventMouseUp);
      Event.observe(document, "mousemove", this.eventMouseMove);
      Event.observe(document, "keypress", this.eventKeypress);
    }
    this.drags.push(draggable);
  },

  unregister: function(draggable) {
    this.drags = this.drags.reject(function(d) { return d==draggable });
    if(this.drags.length == 0) {
      Event.stopObserving(document, "mouseup", this.eventMouseUp);
      Event.stopObserving(document, "mousemove", this.eventMouseMove);
      Event.stopObserving(document, "keypress", this.eventKeypress);
    }
  },

  activate: function(draggable) {
    if(draggable.options.delay) {
      this._timeout = setTimeout(function() {
        Draggables._timeout = null;
        window.focus();
        Draggables.activeDraggable = draggable;
      }.bind(this), draggable.options.delay);
    } else {
      window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
      this.activeDraggable = draggable;
    }
  },

  deactivate: function() {
    this.activeDraggable = null;
  },

  updateDrag: function(event) {
    if(!this.activeDraggable) return;
    var pointer = [Event.pointerX(event), Event.pointerY(event)];
    // Mozilla-based browsers fire successive mousemove events with
    // the same coordinates, prevent needless redrawing (moz bug?)
    if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
    this._lastPointer = pointer;

    this.activeDraggable.updateDrag(event, pointer);
  },

  endDrag: function(event) {
    if(this._timeout) {
      clearTimeout(this._timeout);
      this._timeout = null;
    }
    if(!this.activeDraggable) return;
    this._lastPointer = null;
    this.activeDraggable.endDrag(event);
    this.activeDraggable = null;
  },

  keyPress: function(event) {
    if(this.activeDraggable)
      this.activeDraggable.keyPress(event);
  },

  addObserver: function(observer) {
    this.observers.push(observer);
    this._cacheObserverCallbacks();
  },

  removeObserver: function(element) {  // element instead of observer fixes mem leaks
    this.observers = this.observers.reject( function(o) { return o.element==element });
    this._cacheObserverCallbacks();
  },

  notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
    if(this[eventName+'Count'] > 0)
      this.observers.each( function(o) {
        if(o[eventName]) o[eventName](eventName, draggable, event);
      });
    if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
  },

  _cacheObserverCallbacks: function() {
    ['onStart','onEnd','onDrag'].each( function(eventName) {
      Draggables[eventName+'Count'] = Draggables.observers.select(
        function(o) { return o[eventName]; }
      ).length;
    });
  }
};

/*--------------------------------------------------------------------------*/

var Draggable = Class.create({
  initialize: function(element) {
    var defaults = {
      handle: false,
      reverteffect: function(element, top_offset, left_offset) {
        var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
        new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,
          queue: {scope:'_draggable', position:'end'}
        });
      },
      endeffect: function(element) {
        var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;
        new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity,
          queue: {scope:'_draggable', position:'end'},
          afterFinish: function(){
            Draggable._dragging[element] = false
          }
        });
      },
      zindex: 1000,
      revert: false,
      quiet: false,
      scroll: false,
      scrollSensitivity: 20,
      scrollSpeed: 15,
      snap: false,  // false, or xy or [x,y] or function(x,y){ return [x,y] }
      delay: 0
    };

    if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))
      Object.extend(defaults, {
        starteffect: function(element) {
          element._opacity = Element.getOpacity(element);
          Draggable._dragging[element] = true;
          new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7});
        }
      });

    var options = Object.extend(defaults, arguments[1] || { });

    this.element = $(element);

    if(options.handle && Object.isString(options.handle))
      this.handle = this.element.down('.'+options.handle, 0);

    if(!this.handle) this.handle = $(options.handle);
    if(!this.handle) this.handle = this.element;

    if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
      options.scroll = $(options.scroll);
      this._isScrollChild = Element.childOf(this.element, options.scroll);
    }

    Element.makePositioned(this.element); // fix IE

    this.options  = options;
    this.dragging = false;

    this.eventMouseDown = this.initDrag.bindAsEventListener(this);
    Event.observe(this.handle, "mousedown", this.eventMouseDown);

    Draggables.register(this);
  },

  destroy: function() {
    Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
    Draggables.unregister(this);
  },

  currentDelta: function() {
    return([
      parseInt(Element.getStyle(this.element,'left') || '0'),
      parseInt(Element.getStyle(this.element,'top') || '0')]);
  },

  initDrag: function(event) {
    if(!Object.isUndefined(Draggable._dragging[this.element]) &&
      Draggable._dragging[this.element]) return;
    if(Event.isLeftClick(event)) {
      // abort on form elements, fixes a Firefox issue
      var src = Event.element(event);
      if((tag_name = src.tagName.toUpperCase()) && (
        tag_name=='INPUT' ||
        tag_name=='SELECT' ||
        tag_name=='OPTION' ||
        tag_name=='BUTTON' ||
        tag_name=='TEXTAREA')) return;

      var pointer = [Event.pointerX(event), Event.pointerY(event)];
      var pos     = Position.cumulativeOffset(this.element);
      this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });

      Draggables.activate(this);
      Event.stop(event);
    }
  },

  startDrag: function(event) {
    this.dragging = true;
    if(!this.delta)
      this.delta = this.currentDelta();

    if(this.options.zindex) {
      this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
      this.element.style.zIndex = this.options.zindex;
    }

    if(this.options.ghosting) {
      this._clone = this.element.cloneNode(true);
      this._originallyAbsolute = (this.element.getStyle('position') == 'absolute');
      if (!this._originallyAbsolute)
        Position.absolutize(this.element);
      this.element.parentNode.insertBefore(this._clone, this.element);
    }

    if(this.options.scroll) {
      if (this.options.scroll == window) {
        var where = this._getWindowScroll(this.options.scroll);
        this.originalScrollLeft = where.left;
        this.originalScrollTop = where.top;
      } else {
        this.originalScrollLeft = this.options.scroll.scrollLeft;
        this.originalScrollTop = this.options.scroll.scrollTop;
      }
    }

    Draggables.notify('onStart', this, event);

    if(this.options.starteffect) this.options.starteffect(this.element);
  },

  updateDrag: function(event, pointer) {
    if(!this.dragging) this.startDrag(event);

    if(!this.options.quiet){
      Position.prepare();
      Droppables.show(pointer, this.element);
    }

    Draggables.notify('onDrag', this, event);

    this.draw(pointer);
    if(this.options.change) this.options.change(this);

    if(this.options.scroll) {
      this.stopScrolling();

      var p;
      if (this.options.scroll == window) {
        with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
      } else {
        p = Position.page(this.options.scroll);
        p[0] += this.options.scroll.scrollLeft + Position.deltaX;
        p[1] += this.options.scroll.scrollTop + Position.deltaY;
        p.push(p[0]+this.options.scroll.offsetWidth);
        p.push(p[1]+this.options.scroll.offsetHeight);
      }
      var speed = [0,0];
      if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);
      if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);
      if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);
      if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
      this.startScrolling(speed);
    }

    // fix AppleWebKit rendering
    if(Prototype.Browser.WebKit) window.scrollBy(0,0);

    Event.stop(event);
  },

  finishDrag: function(event, success) {
    this.dragging = false;

    if(this.options.quiet){
      Position.prepare();
      var pointer = [Event.pointerX(event), Event.pointerY(event)];
      Droppables.show(pointer, this.element);
    }

    if(this.options.ghosting) {
      if (!this._originallyAbsolute)
        Position.relativize(this.element);
      delete this._originallyAbsolute;
      Element.remove(this._clone);
      this._clone = null;
    }

    var dropped = false;
    if(success) {
      dropped = Droppables.fire(event, this.element);
      if (!dropped) dropped = false;
    }
    if(dropped && this.options.onDropped) this.options.onDropped(this.element);
    Draggables.notify('onEnd', this, event);

    var revert = this.options.revert;
    if(revert && Object.isFunction(revert)) revert = revert(this.element);

    var d = this.currentDelta();
    if(revert && this.options.reverteffect) {
      if (dropped == 0 || revert != 'failure')
        this.options.reverteffect(this.element,
          d[1]-this.delta[1], d[0]-this.delta[0]);
    } else {
      this.delta = d;
    }

    if(this.options.zindex)
      this.element.style.zIndex = this.originalZ;

    if(this.options.endeffect)
      this.options.endeffect(this.element);

    Draggables.deactivate(this);
    Droppables.reset();
  },

  keyPress: function(event) {
    if(event.keyCode!=Event.KEY_ESC) return;
    this.finishDrag(event, false);
    Event.stop(event);
  },

  endDrag: function(event) {
    if(!this.dragging) return;
    this.stopScrolling();
    this.finishDrag(event, true);
    Event.stop(event);
  },

  draw: function(point) {
    var pos = Position.cumulativeOffset(this.element);
    if(this.options.ghosting) {
      var r   = Position.realOffset(this.element);
      pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
    }

    var d = this.currentDelta();
    pos[0] -= d[0]; pos[1] -= d[1];

    if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
      pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
      pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
    }

    var p = [0,1].map(function(i){
      return (point[i]-pos[i]-this.offset[i])
    }.bind(this));

    if(this.options.snap) {
      if(Object.isFunction(this.options.snap)) {
        p = this.options.snap(p[0],p[1],this);
      } else {
      if(Object.isArray(this.options.snap)) {
        p = p.map( function(v, i) {
          return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this));
      } else {
        p = p.map( function(v) {
          return (v/this.options.snap).round()*this.options.snap }.bind(this));
      }
    }}

    var style = this.element.style;
    if((!this.options.constraint) || (this.options.constraint=='horizontal'))
      style.left = p[0] + "px";
    if((!this.options.constraint) || (this.options.constraint=='vertical'))
      style.top  = p[1] + "px";

    if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
  },

  stopScrolling: function() {
    if(this.scrollInterval) {
      clearInterval(this.scrollInterval);
      this.scrollInterval = null;
      Draggables._lastScrollPointer = null;
    }
  },

  startScrolling: function(speed) {
    if(!(speed[0] || speed[1])) return;
    this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
    this.lastScrolled = new Date();
    this.scrollInterval = setInterval(this.scroll.bind(this), 10);
  },

  scroll: function() {
    var current = new Date();
    var delta = current - this.lastScrolled;
    this.lastScrolled = current;
    if(this.options.scroll == window) {
      with (this._getWindowScroll(this.options.scroll)) {
        if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
          var d = delta / 1000;
          this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );
        }
      }
    } else {
      this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
      this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;
    }

    Position.prepare();
    Droppables.show(Draggables._lastPointer, this.element);
    Draggables.notify('onDrag', this);
    if (this._isScrollChild) {
      Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
      Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
      Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
      if (Draggables._lastScrollPointer[0] < 0)
        Draggables._lastScrollPointer[0] = 0;
      if (Draggables._lastScrollPointer[1] < 0)
        Draggables._lastScrollPointer[1] = 0;
      this.draw(Draggables._lastScrollPointer);
    }

    if(this.options.change) this.options.change(this);
  },

  _getWindowScroll: function(w) {
    var T, L, W, H;
    with (w.document) {
      if (w.document.documentElement && documentElement.scrollTop) {
        T = documentElement.scrollTop;
        L = documentElement.scrollLeft;
      } else if (w.document.body) {
        T = body.scrollTop;
        L = body.scrollLeft;
      }
      if (w.innerWidth) {
        W = w.innerWidth;
        H = w.innerHeight;
      } else if (w.document.documentElement && documentElement.clientWidth) {
        W = documentElement.clientWidth;
        H = documentElement.clientHeight;
      } else {
        W = body.offsetWidth;
        H = body.offsetHeight;
      }
    }
    return { top: T, left: L, width: W, height: H };
  }
});

Draggable._dragging = { };

/*--------------------------------------------------------------------------*/

var SortableObserver = Class.create({
  initialize: function(element, observer) {
    this.element   = $(element);
    this.observer  = observer;
    this.lastValue = Sortable.serialize(this.element);
  },

  onStart: function() {
    this.lastValue = Sortable.serialize(this.element);
  },

  onEnd: function() {
    Sortable.unmark();
    if(this.lastValue != Sortable.serialize(this.element))
      this.observer(this.element)
  }
});

var Sortable = {
  SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,

  sortables: { },

  _findRootElement: function(element) {
    while (element.tagName.toUpperCase() != "BODY") {
      if(element.id && Sortable.sortables[element.id]) return element;
      element = element.parentNode;
    }
  },

  options: function(element) {
    element = Sortable._findRootElement($(element));
    if(!element) return;
    return Sortable.sortables[element.id];
  },

  destroy: function(element){
    element = $(element);
    var s = Sortable.sortables[element.id];

    if(s) {
      Draggables.removeObserver(s.element);
      s.droppables.each(function(d){ Droppables.remove(d) });
      s.draggables.invoke('destroy');

      delete Sortable.sortables[s.element.id];
    }
  },

  create: function(element) {
    element = $(element);
    var options = Object.extend({
      element:     element,
      tag:         'li',       // assumes li children, override with tag: 'tagname'
      dropOnEmpty: false,
      tree:        false,
      treeTag:     'ul',
      overlap:     'vertical', // one of 'vertical', 'horizontal'
      constraint:  'vertical', // one of 'vertical', 'horizontal', false
      containment: element,    // also takes array of elements (or id's); or false
      handle:      false,      // or a CSS class
      only:        false,
      delay:       0,
      hoverclass:  null,
      ghosting:    false,
      quiet:       false,
      scroll:      false,
      scrollSensitivity: 20,
      scrollSpeed: 15,
      format:      this.SERIALIZE_RULE,

      // these take arrays of elements or ids and can be
      // used for better initialization performance
      elements:    false,
      handles:     false,

      onChange:    Prototype.emptyFunction,
      onUpdate:    Prototype.emptyFunction
    }, arguments[1] || { });

    // clear any old sortable with same element
    this.destroy(element);

    // build options for the draggables
    var options_for_draggable = {
      revert:      true,
      quiet:       options.quiet,
      scroll:      options.scroll,
      scrollSpeed: options.scrollSpeed,
      scrollSensitivity: options.scrollSensitivity,
      delay:       options.delay,
      ghosting:    options.ghosting,
      constraint:  options.constraint,
      handle:      options.handle };

    if(options.starteffect)
      options_for_draggable.starteffect = options.starteffect;

    if(options.reverteffect)
      options_for_draggable.reverteffect = options.reverteffect;
    else
      if(options.ghosting) options_for_draggable.reverteffect = function(element) {
        element.style.top  = 0;
        element.style.left = 0;
      };

    if(options.endeffect)
      options_for_draggable.endeffect = options.endeffect;

    if(options.zindex)
      options_for_draggable.zindex = options.zindex;

    // build options for the droppables
    var options_for_droppable = {
      overlap:     options.overlap,
      containment: options.containment,
      tree:        options.tree,
      hoverclass:  options.hoverclass,
      onHover:     Sortable.onHover
    };

    var options_for_tree = {
      onHover:      Sortable.onEmptyHover,
      overlap:      options.overlap,
      containment:  options.containment,
      hoverclass:   options.hoverclass
    };

    // fix for gecko engine
    Element.cleanWhitespace(element);

    options.draggables = [];
    options.droppables = [];

    // drop on empty handling
    if(options.dropOnEmpty || options.tree) {
      Droppables.add(element, options_for_tree);
      options.droppables.push(element);
    }

    (options.elements || this.findElements(element, options) || []).each( function(e,i) {
      var handle = options.handles ? $(options.handles[i]) :
        (options.handle ? $(e).select('.' + options.handle)[0] : e);
      options.draggables.push(
        new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
      Droppables.add(e, options_for_droppable);
      if(options.tree) e.treeNode = element;
      options.droppables.push(e);
    });

    if(options.tree) {
      (Sortable.findTreeElements(element, options) || []).each( function(e) {
        Droppables.add(e, options_for_tree);
        e.treeNode = element;
        options.droppables.push(e);
      });
    }

    // keep reference
    this.sortables[element.id] = options;

    // for onupdate
    Draggables.addObserver(new SortableObserver(element, options.onUpdate));

  },

  // return all suitable-for-sortable elements in a guaranteed order
  findElements: function(element, options) {
    return Element.findChildren(
      element, options.only, options.tree ? true : false, options.tag);
  },

  findTreeElements: function(element, options) {
    return Element.findChildren(
      element, options.only, options.tree ? true : false, options.treeTag);
  },

  onHover: function(element, dropon, overlap) {
    if(Element.isParent(dropon, element)) return;

    if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
      return;
    } else if(overlap>0.5) {
      Sortable.mark(dropon, 'before');
      if(dropon.previousSibling != element) {
        var oldParentNode = element.parentNode;
        element.style.visibility = "hidden"; // fix gecko rendering
        dropon.parentNode.insertBefore(element, dropon);
        if(dropon.parentNode!=oldParentNode)
          Sortable.options(oldParentNode).onChange(element);
        Sortable.options(dropon.parentNode).onChange(element);
      }
    } else {
      Sortable.mark(dropon, 'after');
      var nextElement = dropon.nextSibling || null;
      if(nextElement != element) {
        var oldParentNode = element.parentNode;
        element.style.visibility = "hidden"; // fix gecko rendering
        dropon.parentNode.insertBefore(element, nextElement);
        if(dropon.parentNode!=oldParentNode)
          Sortable.options(oldParentNode).onChange(element);
        Sortable.options(dropon.parentNode).onChange(element);
      }
    }
  },

  onEmptyHover: function(element, dropon, overlap) {
    var oldParentNode = element.parentNode;
    var droponOptions = Sortable.options(dropon);

    if(!Element.isParent(dropon, element)) {
      var index;

      var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
      var child = null;

      if(children) {
        var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);

        for (index = 0; index < children.length; index += 1) {
          if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
            offset -= Element.offsetSize (children[index], droponOptions.overlap);
          } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {
            child = index + 1 < children.length ? children[index + 1] : null;
            break;
          } else {
            child = children[index];
            break;
          }
        }
      }

      dropon.insertBefore(element, child);

      Sortable.options(oldParentNode).onChange(element);
      droponOptions.onChange(element);
    }
  },

  unmark: function() {
    if(Sortable._marker) Sortable._marker.hide();
  },

  mark: function(dropon, position) {
    // mark on ghosting only
    var sortable = Sortable.options(dropon.parentNode);
    if(sortable && !sortable.ghosting) return;

    if(!Sortable._marker) {
      Sortable._marker =
        ($('dropmarker') || Element.extend(document.createElement('DIV'))).
          hide().addClassName('dropmarker').setStyle({position:'absolute'});
      document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
    }
    var offsets = Position.cumulativeOffset(dropon);
    Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});

    if(position=='after')
      if(sortable.overlap == 'horizontal')
        Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
      else
        Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});

    Sortable._marker.show();
  },

  _tree: function(element, options, parent) {
    var children = Sortable.findElements(element, options) || [];

    for (var i = 0; i < children.length; ++i) {
      var match = children[i].id.match(options.format);

      if (!match) continue;

      var child = {
        id: encodeURIComponent(match ? match[1] : null),
        element: element,
        parent: parent,
        children: [],
        position: parent.children.length,
        container: $(children[i]).down(options.treeTag)
      };

      /* Get the element containing the children and recurse over it */
      if (child.container)
        this._tree(child.container, options, child);

      parent.children.push (child);
    }

    return parent;
  },

  tree: function(element) {
    element = $(element);
    var sortableOptions = this.options(element);
    var options = Object.extend({
      tag: sortableOptions.tag,
      treeTag: sortableOptions.treeTag,
      only: sortableOptions.only,
      name: element.id,
      format: sortableOptions.format
    }, arguments[1] || { });

    var root = {
      id: null,
      parent: null,
      children: [],
      container: element,
      position: 0
    };

    return Sortable._tree(element, options, root);
  },

  /* Construct a [i] index for a particular node */
  _constructIndex: function(node) {
    var index = '';
    do {
      if (node.id) index = '[' + node.position + ']' + index;
    } while ((node = node.parent) != null);
    return index;
  },

  sequence: function(element) {
    element = $(element);
    var options = Object.extend(this.options(element), arguments[1] || { });

    return $(this.findElements(element, options) || []).map( function(item) {
      return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
    });
  },

  setSequence: function(element, new_sequence) {
    element = $(element);
    var options = Object.extend(this.options(element), arguments[2] || { });

    var nodeMap = { };
    this.findElements(element, options).each( function(n) {
        if (n.id.match(options.format))
            nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
        n.parentNode.removeChild(n);
    });

    new_sequence.each(function(ident) {
      var n = nodeMap[ident];
      if (n) {
        n[1].appendChild(n[0]);
        delete nodeMap[ident];
      }
    });
  },

  serialize: function(element) {
    element = $(element);
    var options = Object.extend(Sortable.options(element), arguments[1] || { });
    var name = encodeURIComponent(
      (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);

    if (options.tree) {
      return Sortable.tree(element, arguments[1]).children.map( function (item) {
        return [name + Sortable._constructIndex(item) + "[id]=" +
                encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
      }).flatten().join('&');
    } else {
      return Sortable.sequence(element, arguments[1]).map( function(item) {
        return name + "[]=" + encodeURIComponent(item);
      }).join('&');
    }
  }
};

// Returns true if child is contained within element
Element.isParent = function(child, element) {
  if (!child.parentNode || child == element) return false;
  if (child.parentNode == element) return true;
  return Element.isParent(child.parentNode, element);
};

Element.findChildren = function(element, only, recursive, tagName) {
  if(!element.hasChildNodes()) return null;
  tagName = tagName.toUpperCase();
  if(only) only = [only].flatten();
  var elements = [];
  $A(element.childNodes).each( function(e) {
    if(e.tagName && e.tagName.toUpperCase()==tagName &&
      (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
        elements.push(e);
    if(recursive) {
      var grandchildren = Element.findChildren(e, only, recursive, tagName);
      if(grandchildren) elements.push(grandchildren);
    }
  });

  return (elements.length>0 ? elements.flatten() : []);
};

Element.offsetSize = function (element, type) {
  return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
};

// Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//           (c) 2005-2008 Ivan Krstic (http://blogs.law.harvard.edu/ivan)
//           (c) 2005-2008 Jon Tirsen (http://www.tirsen.com)
// Contributors:
//  Richard Livsey
//  Rahul Bhargava
//  Rob Wills
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

// Autocompleter.Base handles all the autocompletion functionality
// that's independent of the data source for autocompletion. This
// includes drawing the autocompletion menu, observing keyboard
// and mouse events, and similar.
//
// Specific autocompleters need to provide, at the very least,
// a getUpdatedChoices function that will be invoked every time
// the text inside the monitored textbox changes. This method
// should get the text for which to provide autocompletion by
// invoking this.getToken(), NOT by directly accessing
// this.element.value. This is to allow incremental tokenized
// autocompletion. Specific auto-completion logic (AJAX, etc)
// belongs in getUpdatedChoices.
//
// Tokenized incremental autocompletion is enabled automatically
// when an autocompleter is instantiated with the 'tokens' option
// in the options parameter, e.g.:
// new Ajax.Autocompleter('id','upd', '/url/', { tokens: ',' });
// will incrementally autocomplete with a comma as the token.
// Additionally, ',' in the above example can be replaced with
// a token array, e.g. { tokens: [',', '\n'] } which
// enables autocompletion on multiple tokens. This is most
// useful when one of the tokens is \n (a newline), as it
// allows smart autocompletion after linebreaks.

if(typeof Effect == 'undefined')
  throw("controls.js requires including script.aculo.us' effects.js library");

var Autocompleter = { };
Autocompleter.Base = Class.create({
  baseInitialize: function(element, update, options) {
    element          = $(element);
    this.element     = element;
    this.update      = $(update);
    this.hasFocus    = false;
    this.changed     = false;
    this.active      = false;
    this.index       = 0;
    this.entryCount  = 0;
    this.oldElementValue = this.element.value;

    if(this.setOptions)
      this.setOptions(options);
    else
      this.options = options || { };

    this.options.paramName    = this.options.paramName || this.element.name;
    this.options.tokens       = this.options.tokens || [];
    this.options.frequency    = this.options.frequency || 0.4;
    this.options.minChars     = this.options.minChars || 1;
    this.options.onShow       = this.options.onShow ||
      function(element, update){
        if(!update.style.position || update.style.position=='absolute') {
          update.style.position = 'absolute';
          Position.clone(element, update, {
            setHeight: false,
            offsetTop: element.offsetHeight
          });
        }
        Effect.Appear(update,{duration:0.15});
      };
    this.options.onHide = this.options.onHide ||
      function(element, update){ new Effect.Fade(update,{duration:0.15}) };

    if(typeof(this.options.tokens) == 'string')
      this.options.tokens = new Array(this.options.tokens);
    // Force carriage returns as token delimiters anyway
    if (!this.options.tokens.include('\n'))
      this.options.tokens.push('\n');

    this.observer = null;

    this.element.setAttribute('autocomplete','off');

    Element.hide(this.update);

    Event.observe(this.element, 'blur', this.onBlur.bindAsEventListener(this));
    Event.observe(this.element, 'keydown', this.onKeyPress.bindAsEventListener(this));
  },

  show: function() {
    if(Element.getStyle(this.update, 'display')=='none') this.options.onShow(this.element, this.update);
    if(!this.iefix &&
      (Prototype.Browser.IE) &&
      (Element.getStyle(this.update, 'position')=='absolute')) {
      new Insertion.After(this.update,
       '<iframe id="' + this.update.id + '_iefix" '+
       'style="display:none;position:absolute;filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);" ' +
       'src="javascript:false;" frameborder="0" scrolling="no"></iframe>');
      this.iefix = $(this.update.id+'_iefix');
    }
    if(this.iefix) setTimeout(this.fixIEOverlapping.bind(this), 50);
  },

  fixIEOverlapping: function() {
    Position.clone(this.update, this.iefix, {setTop:(!this.update.style.height)});
    this.iefix.style.zIndex = 1;
    this.update.style.zIndex = 2;
    Element.show(this.iefix);
  },

  hide: function() {
    this.stopIndicator();
    if(Element.getStyle(this.update, 'display')!='none') this.options.onHide(this.element, this.update);
    if(this.iefix) Element.hide(this.iefix);
  },

  startIndicator: function() {
    if(this.options.indicator) Element.show(this.options.indicator);
  },

  stopIndicator: function() {
    if(this.options.indicator) Element.hide(this.options.indicator);
  },

  onKeyPress: function(event) {
    if(this.active)
      switch(event.keyCode) {
       case Event.KEY_TAB:
       case Event.KEY_RETURN:
         this.selectEntry();
         Event.stop(event);
       case Event.KEY_ESC:
         this.hide();
         this.active = false;
         Event.stop(event);
         return;
       case Event.KEY_LEFT:
       case Event.KEY_RIGHT:
         return;
       case Event.KEY_UP:
         this.markPrevious();
         this.render();
         Event.stop(event);
         return;
       case Event.KEY_DOWN:
         this.markNext();
         this.render();
         Event.stop(event);
         return;
      }
     else
       if(event.keyCode==Event.KEY_TAB || event.keyCode==Event.KEY_RETURN ||
         (Prototype.Browser.WebKit > 0 && event.keyCode == 0)) return;

    this.changed = true;
    this.hasFocus = true;

    if(this.observer) clearTimeout(this.observer);
      this.observer =
        setTimeout(this.onObserverEvent.bind(this), this.options.frequency*1000);
  },

  activate: function() {
    this.changed = false;
    this.hasFocus = true;
    this.getUpdatedChoices();
  },

  onHover: function(event) {
    var element = Event.findElement(event, 'LI');
    if(this.index != element.autocompleteIndex)
    {
        this.index = element.autocompleteIndex;
        this.render();
    }
    Event.stop(event);
  },

  onClick: function(event) {
    var element = Event.findElement(event, 'LI');
    this.index = element.autocompleteIndex;
    this.selectEntry();
    this.hide();
  },

  onBlur: function(event) {
    // needed to make click events working
    setTimeout(this.hide.bind(this), 250);
    this.hasFocus = false;
    this.active = false;
  },

  render: function() {
    if(this.entryCount > 0) {
      for (var i = 0; i < this.entryCount; i++)
        this.index==i ?
          Element.addClassName(this.getEntry(i),"selected") :
          Element.removeClassName(this.getEntry(i),"selected");
      if(this.hasFocus) {
        this.show();
        this.active = true;
      }
    } else {
      this.active = false;
      this.hide();
    }
  },

  markPrevious: function() {
    if(this.index > 0) this.index--;
      else this.index = this.entryCount-1;
    this.getEntry(this.index).scrollIntoView(true);
  },

  markNext: function() {
    if(this.index < this.entryCount-1) this.index++;
      else this.index = 0;
    this.getEntry(this.index).scrollIntoView(false);
  },

  getEntry: function(index) {
    return this.update.firstChild.childNodes[index];
  },

  getCurrentEntry: function() {
    return this.getEntry(this.index);
  },

  selectEntry: function() {
    this.active = false;
    this.updateElement(this.getCurrentEntry());
  },

  updateElement: function(selectedElement) {
    if (this.options.updateElement) {
      this.options.updateElement(selectedElement);
      return;
    }
    var value = '';
    if (this.options.select) {
      var nodes = $(selectedElement).select('.' + this.options.select) || [];
      if(nodes.length>0) value = Element.collectTextNodes(nodes[0], this.options.select);
    } else
      value = Element.collectTextNodesIgnoreClass(selectedElement, 'informal');

    var bounds = this.getTokenBounds();
    if (bounds[0] != -1) {
      var newValue = this.element.value.substr(0, bounds[0]);
      var whitespace = this.element.value.substr(bounds[0]).match(/^\s+/);
      if (whitespace)
        newValue += whitespace[0];
      this.element.value = newValue + value + this.element.value.substr(bounds[1]);
    } else {
      this.element.value = value;
    }
    this.oldElementValue = this.element.value;
    this.element.focus();

    if (this.options.afterUpdateElement)
      this.options.afterUpdateElement(this.element, selectedElement);
  },

  updateChoices: function(choices) {
    if(!this.changed && this.hasFocus) {
      this.update.innerHTML = choices;
      Element.cleanWhitespace(this.update);
      Element.cleanWhitespace(this.update.down());

      if(this.update.firstChild && this.update.down().childNodes) {
        this.entryCount =
          this.update.down().childNodes.length;
        for (var i = 0; i < this.entryCount; i++) {
          var entry = this.getEntry(i);
          entry.autocompleteIndex = i;
          this.addObservers(entry);
        }
      } else {
        this.entryCount = 0;
      }

      this.stopIndicator();
      this.index = 0;

      if(this.entryCount==1 && this.options.autoSelect) {
        this.selectEntry();
        this.hide();
      } else {
        this.render();
      }
    }
  },

  addObservers: function(element) {
    Event.observe(element, "mouseover", this.onHover.bindAsEventListener(this));
    Event.observe(element, "click", this.onClick.bindAsEventListener(this));
  },

  onObserverEvent: function() {
    this.changed = false;
    this.tokenBounds = null;
    if(this.getToken().length>=this.options.minChars) {
      this.getUpdatedChoices();
    } else {
      this.active = false;
      this.hide();
    }
    this.oldElementValue = this.element.value;
  },

  getToken: function() {
    var bounds = this.getTokenBounds();
    return this.element.value.substring(bounds[0], bounds[1]).strip();
  },

  getTokenBounds: function() {
    if (null != this.tokenBounds) return this.tokenBounds;
    var value = this.element.value;
    if (value.strip().empty()) return [-1, 0];
    var diff = arguments.callee.getFirstDifferencePos(value, this.oldElementValue);
    var offset = (diff == this.oldElementValue.length ? 1 : 0);
    var prevTokenPos = -1, nextTokenPos = value.length;
    var tp;
    for (var index = 0, l = this.options.tokens.length; index < l; ++index) {
      tp = value.lastIndexOf(this.options.tokens[index], diff + offset - 1);
      if (tp > prevTokenPos) prevTokenPos = tp;
      tp = value.indexOf(this.options.tokens[index], diff + offset);
      if (-1 != tp && tp < nextTokenPos) nextTokenPos = tp;
    }
    return (this.tokenBounds = [prevTokenPos + 1, nextTokenPos]);
  }
});

Autocompleter.Base.prototype.getTokenBounds.getFirstDifferencePos = function(newS, oldS) {
  var boundary = Math.min(newS.length, oldS.length);
  for (var index = 0; index < boundary; ++index)
    if (newS[index] != oldS[index])
      return index;
  return boundary;
};

Ajax.Autocompleter = Class.create(Autocompleter.Base, {
  initialize: function(element, update, url, options) {
    this.baseInitialize(element, update, options);
    this.options.asynchronous  = true;
    this.options.onComplete    = this.onComplete.bind(this);
    this.options.defaultParams = this.options.parameters || null;
    this.url                   = url;
  },

  getUpdatedChoices: function() {
    this.startIndicator();

    var entry = encodeURIComponent(this.options.paramName) + '=' +
      encodeURIComponent(this.getToken());

    this.options.parameters = this.options.callback ?
      this.options.callback(this.element, entry) : entry;

    if(this.options.defaultParams)
      this.options.parameters += '&' + this.options.defaultParams;

    new Ajax.Request(this.url, this.options);
  },

  onComplete: function(request) {
    this.updateChoices(request.responseText);
  }
});

// The local array autocompleter. Used when you'd prefer to
// inject an array of autocompletion options into the page, rather
// than sending out Ajax queries, which can be quite slow sometimes.
//
// The constructor takes four parameters. The first two are, as usual,
// the id of the monitored textbox, and id of the autocompletion menu.
// The third is the array you want to autocomplete from, and the fourth
// is the options block.
//
// Extra local autocompletion options:
// - choices - How many autocompletion choices to offer
//
// - partialSearch - If false, the autocompleter will match entered
//                    text only at the beginning of strings in the
//                    autocomplete array. Defaults to true, which will
//                    match text at the beginning of any *word* in the
//                    strings in the autocomplete array. If you want to
//                    search anywhere in the string, additionally set
//                    the option fullSearch to true (default: off).
//
// - fullSsearch - Search anywhere in autocomplete array strings.
//
// - partialChars - How many characters to enter before triggering
//                   a partial match (unlike minChars, which defines
//                   how many characters are required to do any match
//                   at all). Defaults to 2.
//
// - ignoreCase - Whether to ignore case when autocompleting.
//                 Defaults to true.
//
// It's possible to pass in a custom function as the 'selector'
// option, if you prefer to write your own autocompletion logic.
// In that case, the other options above will not apply unless
// you support them.

Autocompleter.Local = Class.create(Autocompleter.Base, {
  initialize: function(element, update, array, options) {
    this.baseInitialize(element, update, options);
    this.options.array = array;
  },

  getUpdatedChoices: function() {
    this.updateChoices(this.options.selector(this));
  },

  setOptions: function(options) {
    this.options = Object.extend({
      choices: 10,
      partialSearch: true,
      partialChars: 2,
      ignoreCase: true,
      fullSearch: false,
      selector: function(instance) {
        var ret       = []; // Beginning matches
        var partial   = []; // Inside matches
        var entry     = instance.getToken();
        var count     = 0;

        for (var i = 0; i < instance.options.array.length &&
          ret.length < instance.options.choices ; i++) {

          var elem = instance.options.array[i];
          var foundPos = instance.options.ignoreCase ?
            elem.toLowerCase().indexOf(entry.toLowerCase()) :
            elem.indexOf(entry);

          while (foundPos != -1) {
            if (foundPos == 0 && elem.length != entry.length) {
              ret.push("<li><strong>" + elem.substr(0, entry.length) + "</strong>" +
                elem.substr(entry.length) + "</li>");
              break;
            } else if (entry.length >= instance.options.partialChars &&
              instance.options.partialSearch && foundPos != -1) {
              if (instance.options.fullSearch || /\s/.test(elem.substr(foundPos-1,1))) {
                partial.push("<li>" + elem.substr(0, foundPos) + "<strong>" +
                  elem.substr(foundPos, entry.length) + "</strong>" + elem.substr(
                  foundPos + entry.length) + "</li>");
                break;
              }
            }

            foundPos = instance.options.ignoreCase ?
              elem.toLowerCase().indexOf(entry.toLowerCase(), foundPos + 1) :
              elem.indexOf(entry, foundPos + 1);

          }
        }
        if (partial.length)
          ret = ret.concat(partial.slice(0, instance.options.choices - ret.length));
        return "<ul>" + ret.join('') + "</ul>";
      }
    }, options || { });
  }
});

// AJAX in-place editor and collection editor
// Full rewrite by Christophe Porteneuve <tdd@tddsworld.com> (April 2007).

// Use this if you notice weird scrolling problems on some browsers,
// the DOM might be a bit confused when this gets called so do this
// waits 1 ms (with setTimeout) until it does the activation
Field.scrollFreeActivate = function(field) {
  setTimeout(function() {
    Field.activate(field);
  }, 1);
};

Ajax.InPlaceEditor = Class.create({
  initialize: function(element, url, options) {
    this.url = url;
    this.element = element = $(element);
    this.prepareOptions();
    this._controls = { };
    arguments.callee.dealWithDeprecatedOptions(options); // DEPRECATION LAYER!!!
    Object.extend(this.options, options || { });
    if (!this.options.formId && this.element.id) {
      this.options.formId = this.element.id + '-inplaceeditor';
      if ($(this.options.formId))
        this.options.formId = '';
    }
    if (this.options.externalControl)
      this.options.externalControl = $(this.options.externalControl);
    if (!this.options.externalControl)
      this.options.externalControlOnly = false;
    this._originalBackground = this.element.getStyle('background-color') || 'transparent';
    this.element.title = this.options.clickToEditText;
    this._boundCancelHandler = this.handleFormCancellation.bind(this);
    this._boundComplete = (this.options.onComplete || Prototype.emptyFunction).bind(this);
    this._boundFailureHandler = this.handleAJAXFailure.bind(this);
    this._boundSubmitHandler = this.handleFormSubmission.bind(this);
    this._boundWrapperHandler = this.wrapUp.bind(this);
    this.registerListeners();
  },
  checkForEscapeOrReturn: function(e) {
    if (!this._editing || e.ctrlKey || e.altKey || e.shiftKey) return;
    if (Event.KEY_ESC == e.keyCode)
      this.handleFormCancellation(e);
    else if (Event.KEY_RETURN == e.keyCode)
      this.handleFormSubmission(e);
  },
  createControl: function(mode, handler, extraClasses) {
    var control = this.options[mode + 'Control'];
    var text = this.options[mode + 'Text'];
    if ('button' == control) {
      var btn = document.createElement('input');
      btn.type = 'submit';
      btn.value = text;
      btn.className = 'editor_' + mode + '_button';
      if ('cancel' == mode)
        btn.onclick = this._boundCancelHandler;
      this._form.appendChild(btn);
      this._controls[mode] = btn;
    } else if ('link' == control) {
      var link = document.createElement('a');
      link.href = '#';
      link.appendChild(document.createTextNode(text));
      link.onclick = 'cancel' == mode ? this._boundCancelHandler : this._boundSubmitHandler;
      link.className = 'editor_' + mode + '_link';
      if (extraClasses)
        link.className += ' ' + extraClasses;
      this._form.appendChild(link);
      this._controls[mode] = link;
    }
  },
  createEditField: function() {
    var text = (this.options.loadTextURL ? this.options.loadingText : this.getText());
    var fld;
    if (1 >= this.options.rows && !/\r|\n/.test(this.getText())) {
      fld = document.createElement('input');
      fld.type = 'text';
      var size = this.options.size || this.options.cols || 0;
      if (0 < size) fld.size = size;
    } else {
      fld = document.createElement('textarea');
      fld.rows = (1 >= this.options.rows ? this.options.autoRows : this.options.rows);
      fld.cols = this.options.cols || 40;
    }
    fld.name = this.options.paramName;
    fld.value = text; // No HTML breaks conversion anymore
    fld.className = 'editor_field';
    if (this.options.submitOnBlur)
      fld.onblur = this._boundSubmitHandler;
    this._controls.editor = fld;
    if (this.options.loadTextURL)
      this.loadExternalText();
    this._form.appendChild(this._controls.editor);
  },
  createForm: function() {
    var ipe = this;
    function addText(mode, condition) {
      var text = ipe.options['text' + mode + 'Controls'];
      if (!text || condition === false) return;
      ipe._form.appendChild(document.createTextNode(text));
    };
    this._form = $(document.createElement('form'));
    this._form.id = this.options.formId;
    this._form.addClassName(this.options.formClassName);
    this._form.onsubmit = this._boundSubmitHandler;
    this.createEditField();
    if ('textarea' == this._controls.editor.tagName.toLowerCase())
      this._form.appendChild(document.createElement('br'));
    if (this.options.onFormCustomization)
      this.options.onFormCustomization(this, this._form);
    addText('Before', this.options.okControl || this.options.cancelControl);
    this.createControl('ok', this._boundSubmitHandler);
    addText('Between', this.options.okControl && this.options.cancelControl);
    this.createControl('cancel', this._boundCancelHandler, 'editor_cancel');
    addText('After', this.options.okControl || this.options.cancelControl);
  },
  destroy: function() {
    if (this._oldInnerHTML)
      this.element.innerHTML = this._oldInnerHTML;
    this.leaveEditMode();
    this.unregisterListeners();
  },
  enterEditMode: function(e) {
    if (this._saving || this._editing) return;
    this._editing = true;
    this.triggerCallback('onEnterEditMode');
    if (this.options.externalControl)
      this.options.externalControl.hide();
    this.element.hide();
    this.createForm();
    this.element.parentNode.insertBefore(this._form, this.element);
    if (!this.options.loadTextURL)
      this.postProcessEditField();
    if (e) Event.stop(e);
  },
  enterHover: function(e) {
    if (this.options.hoverClassName)
      this.element.addClassName(this.options.hoverClassName);
    if (this._saving) return;
    this.triggerCallback('onEnterHover');
  },
  getText: function() {
    return this.element.innerHTML.unescapeHTML();
  },
  handleAJAXFailure: function(transport) {
    this.triggerCallback('onFailure', transport);
    if (this._oldInnerHTML) {
      this.element.innerHTML = this._oldInnerHTML;
      this._oldInnerHTML = null;
    }
  },
  handleFormCancellation: function(e) {
    this.wrapUp();
    if (e) Event.stop(e);
  },
  handleFormSubmission: function(e) {
    var form = this._form;
    var value = $F(this._controls.editor);
    this.prepareSubmission();
    var params = this.options.callback(form, value) || '';
    if (Object.isString(params))
      params = params.toQueryParams();
    params.editorId = this.element.id;
    if (this.options.htmlResponse) {
      var options = Object.extend({ evalScripts: true }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: params,
        onComplete: this._boundWrapperHandler,
        onFailure: this._boundFailureHandler
      });
      new Ajax.Updater({ success: this.element }, this.url, options);
    } else {
      var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: params,
        onComplete: this._boundWrapperHandler,
        onFailure: this._boundFailureHandler
      });
      new Ajax.Request(this.url, options);
    }
    if (e) Event.stop(e);
  },
  leaveEditMode: function() {
    this.element.removeClassName(this.options.savingClassName);
    this.removeForm();
    this.leaveHover();
    this.element.style.backgroundColor = this._originalBackground;
    this.element.show();
    if (this.options.externalControl)
      this.options.externalControl.show();
    this._saving = false;
    this._editing = false;
    this._oldInnerHTML = null;
    this.triggerCallback('onLeaveEditMode');
  },
  leaveHover: function(e) {
    if (this.options.hoverClassName)
      this.element.removeClassName(this.options.hoverClassName);
    if (this._saving) return;
    this.triggerCallback('onLeaveHover');
  },
  loadExternalText: function() {
    this._form.addClassName(this.options.loadingClassName);
    this._controls.editor.disabled = true;
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        this._form.removeClassName(this.options.loadingClassName);
        var text = transport.responseText;
        if (this.options.stripLoadedTextTags)
          text = text.stripTags();
        this._controls.editor.value = text;
        this._controls.editor.disabled = false;
        this.postProcessEditField();
      }.bind(this),
      onFailure: this._boundFailureHandler
    });
    new Ajax.Request(this.options.loadTextURL, options);
  },
  postProcessEditField: function() {
    var fpc = this.options.fieldPostCreation;
    if (fpc)
      $(this._controls.editor)['focus' == fpc ? 'focus' : 'activate']();
  },
  prepareOptions: function() {
    this.options = Object.clone(Ajax.InPlaceEditor.DefaultOptions);
    Object.extend(this.options, Ajax.InPlaceEditor.DefaultCallbacks);
    [this._extraDefaultOptions].flatten().compact().each(function(defs) {
      Object.extend(this.options, defs);
    }.bind(this));
  },
  prepareSubmission: function() {
    this._saving = true;
    this.removeForm();
    this.leaveHover();
    this.showSaving();
  },
  registerListeners: function() {
    this._listeners = { };
    var listener;
    $H(Ajax.InPlaceEditor.Listeners).each(function(pair) {
      listener = this[pair.value].bind(this);
      this._listeners[pair.key] = listener;
      if (!this.options.externalControlOnly)
        this.element.observe(pair.key, listener);
      if (this.options.externalControl)
        this.options.externalControl.observe(pair.key, listener);
    }.bind(this));
  },
  removeForm: function() {
    if (!this._form) return;
    this._form.remove();
    this._form = null;
    this._controls = { };
  },
  showSaving: function() {
    this._oldInnerHTML = this.element.innerHTML;
    this.element.innerHTML = this.options.savingText;
    this.element.addClassName(this.options.savingClassName);
    this.element.style.backgroundColor = this._originalBackground;
    this.element.show();
  },
  triggerCallback: function(cbName, arg) {
    if ('function' == typeof this.options[cbName]) {
      this.options[cbName](this, arg);
    }
  },
  unregisterListeners: function() {
    $H(this._listeners).each(function(pair) {
      if (!this.options.externalControlOnly)
        this.element.stopObserving(pair.key, pair.value);
      if (this.options.externalControl)
        this.options.externalControl.stopObserving(pair.key, pair.value);
    }.bind(this));
  },
  wrapUp: function(transport) {
    this.leaveEditMode();
    // Can't use triggerCallback due to backward compatibility: requires
    // binding + direct element
    this._boundComplete(transport, this.element);
  }
});

Object.extend(Ajax.InPlaceEditor.prototype, {
  dispose: Ajax.InPlaceEditor.prototype.destroy
});

Ajax.InPlaceCollectionEditor = Class.create(Ajax.InPlaceEditor, {
  initialize: function($super, element, url, options) {
    this._extraDefaultOptions = Ajax.InPlaceCollectionEditor.DefaultOptions;
    $super(element, url, options);
  },

  createEditField: function() {
    var list = document.createElement('select');
    list.name = this.options.paramName;
    list.size = 1;
    this._controls.editor = list;
    this._collection = this.options.collection || [];
    if (this.options.loadCollectionURL)
      this.loadCollection();
    else
      this.checkForExternalText();
    this._form.appendChild(this._controls.editor);
  },

  loadCollection: function() {
    this._form.addClassName(this.options.loadingClassName);
    this.showLoadingText(this.options.loadingCollectionText);
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        var js = transport.responseText.strip();
        if (!/^\[.*\]$/.test(js)) // TODO: improve sanity check
          throw('Server returned an invalid collection representation.');
        this._collection = eval(js);
        this.checkForExternalText();
      }.bind(this),
      onFailure: this.onFailure
    });
    new Ajax.Request(this.options.loadCollectionURL, options);
  },

  showLoadingText: function(text) {
    this._controls.editor.disabled = true;
    var tempOption = this._controls.editor.firstChild;
    if (!tempOption) {
      tempOption = document.createElement('option');
      tempOption.value = '';
      this._controls.editor.appendChild(tempOption);
      tempOption.selected = true;
    }
    tempOption.update((text || '').stripScripts().stripTags());
  },

  checkForExternalText: function() {
    this._text = this.getText();
    if (this.options.loadTextURL)
      this.loadExternalText();
    else
      this.buildOptionList();
  },

  loadExternalText: function() {
    this.showLoadingText(this.options.loadingText);
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        this._text = transport.responseText.strip();
        this.buildOptionList();
      }.bind(this),
      onFailure: this.onFailure
    });
    new Ajax.Request(this.options.loadTextURL, options);
  },

  buildOptionList: function() {
    this._form.removeClassName(this.options.loadingClassName);
    this._collection = this._collection.map(function(entry) {
      return 2 === entry.length ? entry : [entry, entry].flatten();
    });
    var marker = ('value' in this.options) ? this.options.value : this._text;
    var textFound = this._collection.any(function(entry) {
      return entry[0] == marker;
    }.bind(this));
    this._controls.editor.update('');
    var option;
    this._collection.each(function(entry, index) {
      option = document.createElement('option');
      option.value = entry[0];
      option.selected = textFound ? entry[0] == marker : 0 == index;
      option.appendChild(document.createTextNode(entry[1]));
      this._controls.editor.appendChild(option);
    }.bind(this));
    this._controls.editor.disabled = false;
    Field.scrollFreeActivate(this._controls.editor);
  }
});

//**** DEPRECATION LAYER FOR InPlace[Collection]Editor! ****
//**** This only  exists for a while,  in order to  let ****
//**** users adapt to  the new API.  Read up on the new ****
//**** API and convert your code to it ASAP!            ****

Ajax.InPlaceEditor.prototype.initialize.dealWithDeprecatedOptions = function(options) {
  if (!options) return;
  function fallback(name, expr) {
    if (name in options || expr === undefined) return;
    options[name] = expr;
  };
  fallback('cancelControl', (options.cancelLink ? 'link' : (options.cancelButton ? 'button' :
    options.cancelLink == options.cancelButton == false ? false : undefined)));
  fallback('okControl', (options.okLink ? 'link' : (options.okButton ? 'button' :
    options.okLink == options.okButton == false ? false : undefined)));
  fallback('highlightColor', options.highlightcolor);
  fallback('highlightEndColor', options.highlightendcolor);
};

Object.extend(Ajax.InPlaceEditor, {
  DefaultOptions: {
    ajaxOptions: { },
    autoRows: 3,                                // Use when multi-line w/ rows == 1
    cancelControl: 'link',                      // 'link'|'button'|false
    cancelText: 'cancel',
    clickToEditText: 'Click to edit',
    externalControl: null,                      // id|elt
    externalControlOnly: false,
    fieldPostCreation: 'activate',              // 'activate'|'focus'|false
    formClassName: 'inplaceeditor-form',
    formId: null,                               // id|elt
    highlightColor: '#ffff99',
    highlightEndColor: '#ffffff',
    hoverClassName: '',
    htmlResponse: true,
    loadingClassName: 'inplaceeditor-loading',
    loadingText: 'Loading...',
    okControl: 'button',                        // 'link'|'button'|false
    okText: 'ok',
    paramName: 'value',
    rows: 1,                                    // If 1 and multi-line, uses autoRows
    savingClassName: 'inplaceeditor-saving',
    savingText: 'Saving...',
    size: 0,
    stripLoadedTextTags: false,
    submitOnBlur: false,
    textAfterControls: '',
    textBeforeControls: '',
    textBetweenControls: ''
  },
  DefaultCallbacks: {
    callback: function(form) {
      return Form.serialize(form);
    },
    onComplete: function(transport, element) {
      // For backward compatibility, this one is bound to the IPE, and passes
      // the element directly.  It was too often customized, so we don't break it.
      new Effect.Highlight(element, {
        startcolor: this.options.highlightColor, keepBackgroundImage: true });
    },
    onEnterEditMode: null,
    onEnterHover: function(ipe) {
      ipe.element.style.backgroundColor = ipe.options.highlightColor;
      if (ipe._effect)
        ipe._effect.cancel();
    },
    onFailure: function(transport, ipe) {
      alert('Error communication with the server: ' + transport.responseText.stripTags());
    },
    onFormCustomization: null, // Takes the IPE and its generated form, after editor, before controls.
    onLeaveEditMode: null,
    onLeaveHover: function(ipe) {
      ipe._effect = new Effect.Highlight(ipe.element, {
        startcolor: ipe.options.highlightColor, endcolor: ipe.options.highlightEndColor,
        restorecolor: ipe._originalBackground, keepBackgroundImage: true
      });
    }
  },
  Listeners: {
    click: 'enterEditMode',
    keydown: 'checkForEscapeOrReturn',
    mouseover: 'enterHover',
    mouseout: 'leaveHover'
  }
});

Ajax.InPlaceCollectionEditor.DefaultOptions = {
  loadingCollectionText: 'Loading options...'
};

// Delayed observer, like Form.Element.Observer,
// but waits for delay after last key input
// Ideal for live-search fields

Form.Element.DelayedObserver = Class.create({
  initialize: function(element, delay, callback) {
    this.delay     = delay || 0.5;
    this.element   = $(element);
    this.callback  = callback;
    this.timer     = null;
    this.lastValue = $F(this.element);
    Event.observe(this.element,'keyup',this.delayedListener.bindAsEventListener(this));
  },
  delayedListener: function(event) {
    if(this.lastValue == $F(this.element)) return;
    if(this.timer) clearTimeout(this.timer);
    this.timer = setTimeout(this.onTimerEvent.bind(this), this.delay * 1000);
    this.lastValue = $F(this.element);
  },
  onTimerEvent: function() {
    this.timer = null;
    this.callback(this.element, $F(this.element));
  }
});

LH_EFFECT_DURATION = 0.3;
LH_DISCUSSION_POST_RATING_THRESHOLD = (-2);
LH_DISCUSSION_POST_EDIT_THRESHOLD = 600; // 10 Minutes, also enforced on the server.


LearnHub = new function() {

  this.reload = function()
  {
    LearnHub.AutocompletingFields.init();
    LearnHub.XHRAnchors.init();
    LearnHub.XHRForms.init();
    LearnHub.HintedFields.init();
    LearnHub.ProfileEditHelpers.init();
    LearnHub.AssetList.init();
    LearnHub.DateHelper.init();
    LearnHub.Discussions.init();
    LearnHub.FlowPlayer.init();
  }

  this.init = function()
  {
    for (i in LearnHub) if (LearnHub[i].init) LearnHub[i].init();
  }

};


LearnHub.FlowPlayer = new function() {

  this.init = function()
  {
    if ($('video_player')) $f('video_player', '/flash/flowplayer-3.1.2.swf');
  }

};


LearnHub.NewsStories = new function() {

  this.init = function()
  {
    $$('#news_story_edit_anchor').
      invoke('observe', 'click', editToggleHasBeenClicked);
    $$('#news_story_preview_anchor').
      invoke('observe', 'click', previewToggleHasBeenClicked);
  }

  function editToggleHasBeenClicked(event)
  {
    event.stop();
    switchToEditMode()
  }

  function previewToggleHasBeenClicked(event)
  {
    event.stop();
    switchToPreviewMode()
  }

  function switchToEditMode()
  {
    setActiveModeTo('edit');
    $('news_story_preview').hide();
    $('news_story_edit').show()
  }

  function switchToPreviewMode()
  {
    setActiveModeTo('preview');
    $('news_story_edit').hide();
    $('news_story_preview').show();
    LearnHub.Textile.updateElementWithTextile('news_story_preview_body', $('news_story_body').value);
  }

  function setActiveModeTo(mode)
  {
    $$('#news_story_edit_anchor, #news_story_preview_anchor').each(function(element) {
      element.up('li').removeClassName('active');
    });
    switch (mode) {
    case 'preview':
      $('news_story_preview_anchor').up('li').addClassName('active');
      break;
    case 'edit':
      $('news_story_edit_anchor').up('li').addClassName('active');
      break;
    default:
      throw 'unknown mode: ' + mode + ', try preview or edit';
    }
  }

}


LearnHub.Events = new function() {

  this.init = function()
  {
    $$('.event-has-ending-checkbox').
      invoke('observe', 'change', eventHasEndingCheckboxHasBeenClicked);
    updateEndTimeFields();
  }

  function eventHasEndingCheckboxHasBeenClicked(event)
  {
    updateEndTimeFields();
  }

  function updateEndTimeFields()
  {
    var checkbox = $$('.event-has-ending-checkbox')[0];
    if (!checkbox) return;
    $$('.end-time-field').invoke(checkbox.checked ? 'show' : 'hide');
  }

};


LearnHub.Discussions = new function() {

  this.init = function()
  {
    if (!$$('.forum-posts-container').length) return;
    $$('.comment-action-anchor').
      invoke('observe', 'click', commentActionAnchorHasBeenClicked);
    $$('.discussion-posts-sort-newest-anchor').
      invoke('observe', 'click', sortPostsByNewestAnchorHasBeenClicked);
    $$('.discussion-posts-sort-oldest-anchor').
      invoke('observe', 'click', sortPostsByOldestAnchorHasBeenClicked);
    $$('.discussion-posts-sort-best-anchor').
      invoke('observe', 'click', sortPostsByBestAnchorHasBeenClicked);
    $$('.respond-action-anchor').
      invoke('observe', 'click', discussionRespondAnchorHasBeenClicked);
    $$('.discussion-post-comment-link-anchor, .discussion-post-link-anchor').
      invoke('observe', 'click', discussionPostLinkAnchorHasBeenClicked);
    showHideComments();
    applyPostThresholds();
    applyBelowThresholdBehavior();
    showHideAnctionsForCurrentUser();
    sortAllPostsByCurrentSelection();
    goToPostByAnchorName();
  }

  this.postHasBeenAddedToDiscussion = function(post_id)
  {
    var container = $(post_id);
    updateDiscussionPostsCount(container);
    hideShowReplyTitleAndTabs(container);
  }

  this.commentHasBeenAddedToPost = function(post_id)
  {
    updatePostCommentCount($(post_id));
  }

  function floatBestToTop()
  {
    $$('.forum-posts-container').each(function(container) {
      var best_post = container.down('.discussion-post.is-best');
      if (!best_post) return;
      container.down('.discussion-responses').insert({ 'top' : best_post });
    });
  }

  function discussionPostLinkAnchorHasBeenClicked(event)
  {
    var anchor = event.findElement('a');
    var post = findPostCommentByAnchor(anchor) || findPostByAnchor(anchor);
    unhighlightAllPostsAndComments();
    if (!post) return;
    post.addClassName('highlighted');
  }

  function unhighlightAllPostsAndComments()
  {
    $$('.discussion-post-comment, .discussion-post').
      invoke('removeClassName', 'highlighted');
  }

  function postListData(container)
  {
    var posts = container.select('.discussion-post:not(.discussion-topic-post)');
    return posts.map(function(p) {
      return {
        'element' : p,
        'time' : parseInt(p.readAttribute('time')),
        'rating' : parseInt(p.readAttribute('rating')) }
    });
  }

  function sortAllPostsByCurrentSelection()
  {
    $$('.forum-posts-container').each(function(container) {
      sortPostsByCurrentSelection(container);
    });
  }

  function sortPostsByCurrentSelection(container)
  {
    if (container.down('.sort-by-newest-tab').hasClassName('selected'))
      return sortPostsByNewest(container);
    if (container.down('.sort-by-oldest-tab').hasClassName('selected'))
      return sortPostsByOldest(container);
    if (container.down('.sort-by-best-tab').hasClassName('selected'))
      return sortPostsByRating(container);
  }

  function sortPostsByRating(container)
  {
    var sorted = postListData(container).sort(function(a, b) {
      if (a['rating'] == b['rating']) return a['time'] > b['time'] ? 1 : (-1);
      return a['rating'] < b['rating'] ? 1 : (-1);
    });
    updatePosts(container, sorted);
    floatBestToTop(container);
  }

  function orderPostsByNewest(container)
  {
    return postListData(container).sort(function(a, b) {
      if (a['time'] == b['time']) return 0;
      return a['time'] < b['time'] ? 1 : (-1);
    });
  }

  function updatePosts(container, post_data)
  {
    var responses = container.down('.discussion-responses');
    post_data.each(function(post) {
      responses.insert({ 'bottom' : post['element'] });
    });
  }

  function sortPostsByNewest(container)
  {
    updatePosts(container, orderPostsByNewest(container));
  }

  function sortPostsByOldest(container)
  {
    updatePosts(container, orderPostsByNewest(container).reverse());
  }

  function postTime(post)
  {
    return parseInt(post.readAttribute('time'));
  }

  function postRating(post)
  {
    return parseInt(post.readAttribute('rating'));
  }

  function singularPluralForumTitle(title)
  {
    if (title.match(/Response/))      return ['Response', 'Responses'];
    if (title.match(/Answer/))        return ['Answer', 'Answers'];
    if (title.match(/Comment/))       return ['Comment', 'Comments'];
    if (title.match(/Reply|Replies/)) return ['Reply', 'Replies'];
    return [title, title];
  }

  function updateDiscussionPostsCount(container)
  {
    var posts_count = postsCount(container);
    var captions = container.select('.discussion-responses-heading, .discussion-post-count-anchor');
    var singular_plural = singularPluralForumTitle(captions[0].innerHTML);
    var caption = pluralize(posts_count, singular_plural[0], singular_plural[1]);
    captions.invoke('update', caption);
  }

  function postsCount(container)
  {
    return container.select('.discussion-post:not(.discussion-topic-post)').length;
  }

  function hideShowReplyTitleAndTabs(container)
  {
    switch (postsCount(container)) {
    case 0:
      container.select('.discussion-responses-title, .discussion-responses-tab-list').invoke('hide');
      break;
    case 1:
      container.select('.discussion-responses-title').invoke('show');
      container.select('.discussion-responses-tab-list').invoke('hide');
      break;
    default:
      container.select('.discussion-responses-title, .discussion-responses-tab-list').invoke('show');
      break;
    }
  }

  function updatePostCommentCount(post)
  {
    var comment_anchor = post.down('.comment-action-anchor');
    var comments_count = post.select('.discussion-post-comment').length;
    if (0 == comments_count)
      comment_anchor.update('Add A Comment');
    else
      comment_anchor.update(pluralize(comments_count, 'Comment', 'Comments'));
  }

  function pluralize(amount, singular, plural)
  {
    caption = (1 == amount) ? singular : plural;
    return '<strong>' + amount + '</strong> ' + caption;
  }

  function discussionRespondAnchorHasBeenClicked(event)
  {
    event.stop();
    var anchor = event.findElement('a');
    anchor.scrollTo();
  }

  function sortPostsByNewestAnchorHasBeenClicked(event)
  {
    switchToSortTabThroughEvent(event);
    sortPostsByNewest(containerForEvent(event));
  }

  function sortPostsByOldestAnchorHasBeenClicked(event)
  {
    switchToSortTabThroughEvent(event);
    sortPostsByOldest(containerForEvent(event));
  }

  function sortPostsByBestAnchorHasBeenClicked(event)
  {
    switchToSortTabThroughEvent(event);
    sortPostsByRating(containerForEvent(event));
  }

  function containerForEvent(event)
  {
    return containerFor(event.element());
  }

  function containerFor(element)
  {
    return element.up('.forum-posts-container');
  }

  function switchToSortTabThroughEvent(event)
  {
    event.stop();
    var container = containerForEvent(event);
    container.select('.discussion-responses-tab').invoke('removeClassName', 'selected');
    event.findElement('li').addClassName('selected');
  }

  function showHideAnctionsForCurrentUser()
  {
    $$('.discussion-post, .discussion-post-comment').each(showHideActionsForPost);
  }

  function showHideActionsForComment(comment)
  {
    var user = comment.readAttribute('user');
    var edit_anchor = comment.down('.discussion-post-comment-edit-anchor');
    var flag_anchor = comment.down('.discussion-post-comment-flag-anchor');
    if (LearnHub.isLoggedIn()) {
      if (LearnHub.currentUser.username == user) {
        if (edit_anchor)
          isPostInsideEditThreshold(comment) ? edit_anchor.show() : edit_anchor.hide();
        if (flag_anchor) flag_anchor.hide();
      } else {
        if (edit_anchor) edit_anchor.hide();
        if (flag_anchor) flag_anchor.show();
      }
    } else {
      if (edit_anchor) edit_anchor.hide();
      if (flag_anchor) flag_anchor.hide();
    }
  }

  function showHideActionsForPost(post)
  {
    if ($('discussion_topic_post'))
      var discussion_user = $('discussion_topic_post').readAttribute('user');
    else
      var discussion_user = null;
    var post_user = post.readAttribute('user');
    var edit_anchor = post.down('.discussion-post-edit-anchor');
    var flag_anchor = post.down('.discussion-post-flag-anchor');
    var best_anchor = post.down('.discussion-post-mark-best-anchor');
    if (LearnHub.isLoggedIn()) {
      if (LearnHub.currentUser.username == post_user) {
        if (edit_anchor)
          isPostInsideEditThreshold(post) ? edit_anchor.show() : edit_anchor.hide();
        if (flag_anchor) flag_anchor.hide();
      } else {
        if (edit_anchor) edit_anchor.hide();
        if (flag_anchor) flag_anchor.show();
      }
      if (LearnHub.currentUser['username'] == discussion_user) {
        if (best_anchor) best_anchor.show();
      }
    } else {
      if (best_anchor) best_anchor.hide();
      if (edit_anchor) edit_anchor.hide();
      if (flag_anchor) flag_anchor.hide();
    }
    post.select('.discussion-post-comment').each(function(comment) {
      showHideActionsForComment(comment);
    });
  }

  function isPostInsideEditThreshold(post)
  {
    var time_posted = (new Date()).setTime(Date.parse(post.down('abbr.reltime').readAttribute('title')));
    var difference = ((new Date() - time_posted) / 1000);
    return LH_DISCUSSION_POST_EDIT_THRESHOLD > difference;
  }

  function applyPostThresholds()
  {
    var posts = $$('.discussion-post:not(.discussion-topic-post)');
    posts.each(function(post) {
      var rating = post.readAttribute('rating');
      var post_id = parseInt(post.id.gsub('post_', ''));
      if (postIdIsFlagged(post_id) || rating < LH_DISCUSSION_POST_RATING_THRESHOLD)
        post.addClassName('below-threshold');
    });
  }

  function applyBelowThresholdBehavior()
  {
    $$('.discussion-post.below-threshold').invoke('observe', 'click', function(event) {
      event.element().up('.discussion-post').removeClassName('below-threshold');
    });
  }

  function postIdIsFlagged(post_id)
  {
    if (!LearnHub.isLoggedIn()) return false;
    return LearnHub.currentUser['flagged_post_ids'].include(post_id);
  }

  function showHideComments()
  {
    var posts = $$('.discussion-post:not(.discussion-topic-post)');
    posts.each(function(post) {
      var comment_form = post.down('.discussion-post-comment-form');
      var comments_ol = post.down('.discussion-post-comments-list');
      if (!comments_ol) return;
      var comments = comments_ol.select('.discussion-post-comment');
      if (comments_ol.hasClassName('expanded')) {
        comments.invoke('show');
        if (comment_form) comment_form.show();
      } else {
        hidePostComments(comments);
        if (comment_form) comment_form.hide();
      }
    });
  }

  function hidePostComments(comments)
  {
    comments.each(function(comment) {
      var rating = parseInt(comment.readAttribute('rating'));
      ('number' == typeof(rating) && rating > 1) ? comment.show() : comment.hide();
    });
  }

  function goToPostByAnchorName()
  {
    var doc_anchor = Savvica.Utils.getDocumentHash();
    if (!doc_anchor) return;
    $('learnhub_body').scrollTo(); // Fake out the jump to anchor.
    var anchor = $$('a[name="' + doc_anchor + '"]')[0];
    if (!anchor) return;
    var post = findPostByAnchor(anchor);
    var comment = findPostCommentByAnchor(anchor);
    if (!post) return;
    if (comment) {
      togglePostComments(post);
      comment.addClassName('highlighted');
    } else {
      post.addClassName('highlighted');
    }
    anchor.scrollTo({ duration : 2.0 });
  }

  function findPostCommentByAnchor(anchor)
  {
    return anchor.up('.discussion-post-comment')
  }

  function findPostByAnchor(anchor)
  {
    return anchor.up('.discussion-post');
  }

  function togglePostComments(post)
  {
    if (!post) return;
    var comments_ol = post.down('.discussion-post-comments-list');
    comments_ol.toggleClassName('expanded');
    showHideComments();
  }

  function commentActionAnchorHasBeenClicked(event)
  {
    event.stop();
    var anchor = event.findElement('a');
    togglePostComments(anchor.up('.discussion-post'));
  }

};


LearnHub.DiscussionsEdit = new function() {

  this.init = function()
  {
    if ($('discussion_form')) {
      $$('label[for="discussion_discussion_type_discussion"]',
      'label[for="discussion_discussion_type_question"]',
      'label[for="discussion_discussion_type_url"]').
      invoke('observe', 'click', typeLabelWasClicked);
      refreshType();
    }
  }

  function typeLabelWasClicked(event)
  {
    refreshType();
  }

  function selectedType()
  {
    if ($('discussion_discussion_type_question').checked)
      return 'question';
    if ($('discussion_discussion_type_url').checked)
      return 'url';
    if ($('discussion_discussion_type_discussion').checked)
      return 'discussion';
    return null;
  }

  function refreshType()
  {
    switch (selectedType()) {
    case 'question':
      setToQuestion();
      break;
    case 'url':
      setToURL();
      break;
    default:
      setToDiscussion();
      break;
    }
  }

  function setToQuestion()
  {
    hideURLFields();
    setBodyLabelTo('Your Question');
  }

  function setToURL()
  {
    showURLFields();
    setBodyLabelTo('Description');
  }

  function setToDiscussion()
  {
    hideURLFields();
    setBodyLabelTo();
  }

  function setBodyLabelTo(caption)
  {
    var label = (caption || 'Topic');
    $('discussion_body_label').update(label);
  }

  function showURLFields()
  {
    $$('.discussion-url-field').invoke('show');
  }

  function hideURLFields()
  {
    $$('.discussion-url-field').invoke('hide');
  }

};


LearnHub.DateHelper = new function() {

  this.init = function()
  {
    $$('abbr.reltime').each(function(abbr) {
      time = abbr.readAttribute('title');
      abbr.update(LearnHub.DateHelper.timeAgoInWordsWithParsing(time));
    });
  }

  // Expects RFC822
  this.timeAgoInWordsWithParsing = function(from)
  {
    var date = new Date;
    date.setTime(Date.parse(from));
    return this.timeAgoInWords(date);
  }

  this.timeAgoInWords = function(from)
  {
    return this.distanceOfTimeInWords(new Date, from);
  }

  this.distanceOfTimeInWords = function(to, from)
  {
    var distance_in_seconds = ((to - from) / 1000);
    var distance_in_minutes = (distance_in_seconds / 60).floor();
    if (distance_in_minutes == 0)
      return 'less than a minute ago';
    if (distance_in_minutes == 1)
      return 'a minute ago';
    if (distance_in_minutes < 45)
      return distance_in_minutes + ' minutes ago';
    if (distance_in_minutes < 90)
      return 'about 1 hour ago';
    if (distance_in_minutes < 1440)
      return 'about ' + (distance_in_minutes / 60).floor() + ' hours ago';
    if (distance_in_minutes < 2880)
      return '1 day ago';
    if (distance_in_minutes < 43200)
      return (distance_in_minutes / 1440).floor() + ' days ago';
    if (distance_in_minutes < 86400)
      return 'about 1 month ago';
    if (distance_in_minutes < 525960)
      return (distance_in_minutes / 43200).floor() + ' months ago';
    if (distance_in_minutes < 1051199)
      return 'about 1 year ago';
    return 'over ' + (distance_in_minutes / 525960).floor() + ' years ago';
  }

};


LearnHub.DirectoryMap = {

  map : null,

  init : function()
  {
    if (!this.pageHasMapData() || !$('directory_map_viewport')) return;
    this.loadMap();
    this.loadMapMarkers();
    this.zoomOnInit();
    $$('a.zoom-to-org-anchor').
      invoke('observe', 'click', LearnHub.DirectoryMap.zoomToOrgViaEvent);
  },

  pageHasMapData : function() {
    return typeof(LH_DIRECTORY_MAP_DATA) != 'undefined' &&
           typeof(LH_DIRECTORY_MAP_KEYS) != 'undefined' &&
           typeof(LH_DIRECTORY_MAP_LAT_LONG_ZOOM) != 'undefined';
  },

  loadMap : function()
  {
    LearnHub.DirectoryMap.map = new GMap2($('directory_map_viewport'));
    var lat  = LH_DIRECTORY_MAP_LAT_LONG_ZOOM[0];
    var long = LH_DIRECTORY_MAP_LAT_LONG_ZOOM[1];
    var zoom = LH_DIRECTORY_MAP_LAT_LONG_ZOOM[2];
    LearnHub.DirectoryMap.map.setCenter(new GLatLng(lat, long), zoom);
    LearnHub.DirectoryMap.map.addControl(new GSmallMapControl());
  },

  loadMapMarkers : function()
  {
    $A(LH_DIRECTORY_MAP_KEYS).each(function(key) {
      var data = LH_DIRECTORY_MAP_DATA[key];
      var marker = LearnHub.DirectoryMap.createMarker(data);
      LearnHub.DirectoryMap.map.addOverlay(marker);
    });
  },

  createMarker : function(data)
  {
    var latlng = new GLatLng(data['loc'][0], data['loc'][1]);
    var marker = new GMarker(latlng, { 'title' : data['name'] });
    GEvent.addListener(marker, 'click', function() {
      LearnHub.DirectoryMap.zoomToOrg(data);
    });
    return marker;
  },

  zoomOnInit : function()
  {
    if (LH_DIRECTORY_MAP_ZOOM_TO_ORG_ID)
      LearnHub.DirectoryMap.zoomToOrg(LH_DIRECTORY_MAP_DATA[LH_DIRECTORY_MAP_ZOOM_TO_ORG_ID]);
  },

  zoomToOrgViaEvent : function(event)
  {
    var anchor = event.findElement('a');
    var key_id = anchor.id.gsub('zoom_to_org_anchor_', '');
    var data_hash = LH_DIRECTORY_MAP_DATA[key_id];
    LearnHub.DirectoryMap.zoomToOrg(data_hash);
    $('directory_map_named_anchor').scrollTo();
    event.stop();
  },

  zoomToOrg : function(data)
  {
    var latlng = new GLatLng(data['loc'][0], data['loc'][1]);
    if (LearnHub.DirectoryMap.map.getZoom() < 4)
      LearnHub.DirectoryMap.map.setCenter(latlng, 4);
    LearnHub.DirectoryMap.map.openInfoWindowHtml(latlng, data['html'], {});
  }

};


LearnHub.Textile = {

  updateElementWithTextile : function(element, textile)
  {
    new Ajax.Request('/api/converters/textile_to_html', {
      method : 'post',
      parameters : { 'textile' : textile },
      onSuccess : function(tx) { $(element).update(tx.responseText) },
      onFailure : function(tx) { $(element).update(textile) }.bind(this)
    });
  }

};


var Color = Class.create({

  initialize : function(packed_hex)
  {
    this.color = (packed_hex || '#000000');
    this.threshold = 0.5;
  },

  toHex : function()
  {
    return this.color.toString();
  },

  toRGB : function()
  {
    return this.unpack(this.color);
  },

  toHSL : function()
  {
    var rgb = this.toRGB();
    var min, max, delta, h, s, l;
    var r = rgb[0], g = rgb[1], b = rgb[2];
    min = Math.min(r, Math.min(g, b));
    max = Math.max(r, Math.max(g, b));
    delta = max - min;
    l = (min + max) / 2;
    s = 0;
    if (l > 0 && l < 1) s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
    h = 0;
    if (delta > 0) {
      if (max == r && max != g) h += (g - b) / delta;
      if (max == g && max != b) h += (2 + (b - r) / delta);
      if (max == b && max != r) h += (4 + (r - g) / delta);
      h /= 6;
    }
    return [h, s, l];
  },

  inspect : function()
  {
    var triplet = this.toRGB();
    var red = Math.round(triplet[0] * 100);
    var green = Math.round(triplet[1] * 100);
    var blue = Math.round(triplet[2] * 100);
    return '#<Color:{red:' + red + '%, green:' + green + '%, blue:' + blue + '%}>';
  },

  limitHSL : function(type, value, step)
  {
    var stepped_value = value + step;
    switch (type) {
    case 'hue':
      if (stepped_value > 360.0) return 360.0;
      if (stepped_value < 0.0) return 0.0;
      break;
    case 'saturation':
    case 'luminance':
      if (stepped_value > 1.0) return 1.0;
      if (stepped_value < 0.0) return 0.0;
      break;
    }
    return stepped_value;
  },

  step : function(steppings)
  {
    var hsl = this.toHSL();
    var setup = $H({
      'hue' : 0.0,
      'saturation' : 0.0,
      'luminance' : 0.0
    }).update($H(steppings));
    var stepped_hsl = [
      this.limitHSL('hue', hsl[0], setup.get('hue')),
      this.limitHSL('saturation', hsl[1], setup.get('saturation')),
      this.limitHSL('luminance', hsl[2], setup.get('luminance'))
    ];
    var rgb = this.HSLtoRGB(stepped_hsl);
    return this.pack(rgb);
  },

  unpack : function(hexcolor)
  {
    if (7 == hexcolor.length) return [
      parseInt('0x' + hexcolor.substring(1, 3)) / 255,
      parseInt('0x' + hexcolor.substring(3, 5)) / 255,
      parseInt('0x' + hexcolor.substring(5, 7)) / 255 ];
    if (4 == hexcolor.length) return [
      parseInt('0x' + hexcolor.substring(1, 2)) / 15,
      parseInt('0x' + hexcolor.substring(2, 3)) / 15,
      parseInt('0x' + hexcolor.substring(3, 4)) / 15 ];
  },

  pack : function(rgb)
  {
    var r = Math.round(rgb[0] * 255);
    var g = Math.round(rgb[1] * 255);
    var b = Math.round(rgb[2] * 255);
    return ('#' + (r < 16 ? '0' : '') + r.toString(16) +
                  (g < 16 ? '0' : '') + g.toString(16) +
                  (b < 16 ? '0' : '') + b.toString(16)).toUpperCase();
  },

  HSLtoRGB : function(hsl)
  {
    var m1, m2, r, g, b;
    var h = hsl[0], s = hsl[1], l = hsl[2];
    m2 = (l <= 0.5) ? l * (s + 1) : l + s - l * s;
    m1 = l * 2 - m2;
    return [this.hueToRGB(m1, m2, h + 0.33333),
            this.hueToRGB(m1, m2, h),
            this.hueToRGB(m1, m2, h - 0.33333)];
  },

  hueToRGB : function(m1, m2, h)
  {
    h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
    if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
    if (h * 2 < 1) return m2;
    if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
    return m1;
  }

});


LearnHub.BadgeBuilder = new function() {

  var CSS_TEMPLATE = [
    '<style type="text/css">',
    '.lh-badge { padding: 6px; background-color: $background_color; border: 3px solid $border_color; }',
    '.lh-badge-text { float: left; color: $text_color; font-family: \'Lucida Grande\', Tahoma, Sans-Serif; }',
    '.lh-badge-text a { color: $text_color; text-decoration: none; }',
    '.lh-badge-text a:hover { color: $text_color; text-decoration: underline; }',
    '.lh-badge-text-caption { font-size: 11px; }',
    '.lh-badge-text p { margin: 0; padding: 0; }',
    '.lh-badge-text-name { font-weight: bold; font-size: 18px; }',
    '.lh-badge-avatar { float: left; padding-right: 8px; }',
    '.lh-badge-avatar img { border: none; display: block; width: 52px; height: 52px; }',
    '</style>'].join("\n")

  var colors = {
    'background_color' : '#FFFFFF',
    'text_color' : '#111111',
    'border_color' : '#EEEEEE'
  };

  this.init = function()
  {
    if (!$('color_picker')) return;
    if (!$('color')) return;
    $('color_picker').protofarbtastic(colorWheelHasChanged);
    $('color').observe('keyup', colorTextFieldHasChanged);
    $$('.badge-example a').invoke('observe', 'click', hasBeenClicked);
    $$('.badge-example').invoke('observe', 'click', hasBeenClicked);
  }

  function colorTextFieldHasChanged(event)
  {
    var value = $F(event.findElement('input'));
    if ((-1) == value.search(/#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})/)) return;
    if (4 == value.length || 7 == value.length) changeColorTo(value);
  }

  function colorWheelHasChanged(packed_color)
  {
    $('color').value = packed_color;
    changeColorTo(packed_color);
  }

  function changeColorTo(packed_color)
  {
    var color = new Color(packed_color);
    var hsl = color.toHSL();
    $('color').setStyle({
      backgroundColor : packed_color,
      color : hsl[2] > 0.6 ? '#000000' : '#ffffff'
    });
    updateColorCache(color);
    updateBadgeExamples();
  }

  function updateBadgeExamples()
  {
    $$('.lh-badge').invoke('setStyle', {
      'backgroundColor' : colors['background_color'],
      'borderColor' : colors['border_color']
    });
    $$('.lh-badge-text', '.lh-badge-text a').invoke('setStyle', {
      'color' : colors['text_color']
    });
  }

  function updateColorCache(color)
  {
    var hsl = color.toHSL();
    var border_color = color.step({ 'luminance' : (-0.1) });
    var background_color = color.toHex();
    var text_color = (hsl[2] + 0.1) > 0.5 ? '#000' : '#fff';
    colors['background_color'] = background_color;
    colors['text_color'] = text_color;
    colors['border_color'] = border_color;
  }

  function hasBeenClicked(event)
  {
    event.stop()
    var container = event.element().up('.badge-example');
    updateBadgeCode(generateCodeForBadge(container));
  }

  function updateBadgeCode(new_code)
  {
    $('badge_code').value = '';
    $('badge_code').value = new_code;
    $('badge_code').highlight({ duration : LH_EFFECT_DURATION });
  }

  function templateCSS(substitutions)
  {
    return $H(colors).inject(CSS_TEMPLATE, function(memo, pair) {
      return memo.gsub(('\\$' + pair[0]), pair[1]);
    });
  }

  function generateCodeForBadge(badge_container)
  {
    var css = templateCSS();
    var html = tidyHTML(badge_container.innerHTML);
    return "<!-- Start LearnHub Badge -->\n" +
      css + "\n" +
      html +
      '<!-- End LearnHub Badge -->';
  }

  function tidyHTML(html)
  {
    var dirty_lines = html.split("\n");
    var clean_lines = dirty_lines.map(function(line) { return line.strip() });
    return clean_lines.join("\n")
  }

};


LearnHub.AssetList = new function() {

  this.init = function()
  {
    if (!$('lesson_page_photos')) return;
    $$('.insert-photo-anchor').
      invoke('observe', 'click', insertPhotoAnchorHasBeenClicked);
  }

  function insertPhotoAnchorHasBeenClicked(event)
  {
    event.stop();
    var anchor = event.findElement('a');
    embedPhotoURL(anchor.href);
  }

  function isTextile()
  {
    return $('lesson_page_body').hasClassName('textile');
  }

  function embedPhotoURL(photo_url)
  {
    if (isTextile())
      Savvica.Utils.insertAtCaret($('lesson_page_body'), ('!' + photo_url + '!'));
    else
      YUI_RTE_SINGLE.execCommand('inserthtml', ('<img src="' + photo_url + '" alt="" />'));
  }

};


LearnHub.LessonPageBuilder = new function() {

  this.init = function()
  {
    if (!$('lesson_page_body')) return;
    if (!$('lesson_page_form')) return;
    $('lesson_page_save_button').observe('click', saveButtonHasBeenClicked);
    $('lesson_page_edit_anchor').observe('click', editToggleHasBeenSet);
    $('lesson_page_preview_anchor').observe('click', previewToggleHasBeenSet);
    initAutoSave();
  }

  function editToggleHasBeenSet(event)
  {
    event.stop();
    switchToEdit();
  }

  function previewToggleHasBeenSet(event)
  {
    event.stop();
    switchToPreview();
  }

  function saveButtonHasBeenClicked(event)
  {
    event.stop();
    save();
  }

  function isInTextileMode()
  {
    return $('lesson_page_body').hasClassName('textile');
  }

  function saveIsDisabled()
  {
    return $('lesson_page_save_button').disabled ? true : false;
  }

  function setSaveDisabled(value)
  {
    $('lesson_page_save_button').disabled = value;
    if (saveIsDisabled())
      $('lesson_page_submit_actions_form').addClassName('saving');
    else
      $('lesson_page_submit_actions_form').removeClassName('saving');
  }

  function switchToEdit()
  {
    $('lesson_page_preview_pane').hide();
    $('lesson_page_edit_pane').show();
    $('lesson_page_edit_anchor').up().addClassName('active');
    $('lesson_page_preview_anchor').up().removeClassName('active');
  }

  function switchToPreview()
  {
    $('lesson_page_preview_pane').show();
    $('lesson_page_edit_pane').hide();
    $('lesson_page_preview_anchor').up().addClassName('active');
    $('lesson_page_edit_anchor').up().removeClassName('active');
    if (isInTextileMode())
      LearnHub.Textile.updateElementWithTextile(
        'lesson_page_preview_body',
        $('lesson_page_body').value
      );
    else
      $('lesson_page_preview_body').update(YUI_RTE_SINGLE.cleanHTML());
  }

  function pageHasBeenSaved(transfer)
  {
    // Currently, do nothing.
  }

  function initAutoSave()
  {
    // Only save the page if it has been changed. -- CKN
    new Form.Observer('lesson_page_form', 60, save);
  }

  function save()
  {
    if (saveIsDisabled()) return;
    setSaveDisabled(true);
    if (!isInTextileMode()) {
      YUI_RTE_SINGLE.saveHTML();
    }
    $('lesson_page_form').request({
      onSuccess : pageHasBeenSaved,
      onComplete : function() { setSaveDisabled(false) }
    });
  }

};


LearnHub.ProfileEditHelpers = {

  init : function()
  {
    $$('.progress-list-block .progress-bar-sparkline').
      invoke('observe', 'click', this.toggleProgressList);
    if (!$('edit_public_profile_grid')) return;
    $$('select[id^="user_website_default_type_"]').
      invoke('observe', 'change', this.checkWebsiteFieldType);
    $$('.currently-here-checkbox').
      invoke('observe', 'change', this.toggleEndDateVisibility);
  },

  toggleProgressList : function(event)
  {
    var element = event.element().up('.progress-list-block').down('.progress-list-contents').toggle();
  },

  toggleEndDateVisibility : function(event)
  {
    var check_box = event.findElement('input');
    var table_row = check_box.up('tr').adjacent('.end-date').first();
    check_box.checked ? table_row.hide() : table_row.show();
  },

  checkWebsiteFieldType : function(event)
  {
    var select = event.findElement('select');
    var fields = select.adjacent('input[id^="user_website_type_"]');
    $F(select) == '#' ? fields.invoke('show') : fields.invoke('hide');
  }

};


LearnHub.SlidingPrefPanes = {

  init : function()
  {
    var title_anchors = $$('.sliding-preference-pane-title-anchor');
    if (title_anchors.size() == 0) return;
    title_anchors.invoke('observe', 'click', this.openPaneViaEvent);
    var anchor_name = Savvica.Utils.getDocumentHash();
    if (anchor_name) this.openPaneViaAnchorName(anchor_name);
  },

  openPaneViaEvent : function(event)
  {
    var anchor = event.findElement('a');
    var pane = anchor.up(2);
    LearnHub.SlidingPrefPanes.openPane(pane);
    event.stop();
  },

  openPaneViaAnchorName : function(anchor_name)
  {
    var anchors = $$('.sliding-preference-pane-body a[name=' + anchor_name + ']');
    if (anchors.size() == 0) return;
    var pane = anchors[0].up('.sliding-preference-pane');
    LearnHub.SlidingPrefPanes.openPane(pane);
  },

  openPane : function(pane_element)
  {
    if (pane_element.hasClassName('open')) return;
    LearnHub.SlidingPrefPanes.closeAll();
    pane_element.addClassName('open');
    pane_element.down('.sliding-preference-pane-body-content').
      blindDown({ duration : LH_EFFECT_DURATION });
  },

  closeAll : function()
  {
    $$('.sliding-preference-pane-body-content').invoke('hide');
    $$('.sliding-preference-pane').invoke('removeClassName', 'open');
  }

};


LearnHub.AutocompletingFields = {

  init : function()
  {
    $$('input[autocompleter]').each(this.attach);
  },

  attach : function(input)
  {
    var url = input.readAttribute('autocompleter');
    if (!url || input.hasClassName('initialized')) return;
    var container = new Element('div', { 'class' : 'autocompleter-choices' });
    input.insert({ after : container });
    new Ajax.Autocompleter(input.identify(), container.identify(), url, {
      paramName : 'q'
    });
    input.addClassName('initialized');
  }

};


// form.xhr-action
LearnHub.XHRForms = new function() {

  this.init = function()
  {
    $$('form.xhr-action').invoke('observe', 'submit', submitHasBeenInvoked);
  }

  function submitHasBeenInvoked(event)
  {
    var form = event.findElement('form');
    if (form.hasClassName('disabled')) return event.stop();
    if (!showPrompt(form)) return event.stop();
    form.addClassName('disabled');
    form.request({
      onComplete : function(tx) {
        form.removeClassName('disabled');
        form.reset();
        LearnHub.reload();
      }
    });
    event.stop();
  }

  function showPrompt(form)
  {
    var message = form.readAttribute('prompt');
    return message ? confirm(message) : true;
  }

};


// a.xhr-action{ :href => 'some/action' }
LearnHub.XHRAnchors = {

  init : function()
  {
    $$('a.xhr-action[href]').invoke('observe', 'click', this.executeAction);
  },

  executeAction : function(event)
  {
    var anchor = event.findElement('a');
    if (anchor.hasClassName('disabled')) return event.stop();
    if (!LearnHub.XHRAnchors.callPrompt(anchor)) return event.stop();
    anchor.addClassName('disabled');
    new Ajax.Request(anchor.href, {
      method : 'get',
      onComplete : function(tx) {
        anchor.removeClassName('disabled');
        LearnHub.reload();
      }
    });
    event.stop();
  },

  callPrompt : function(anchor)
  {
    var message = anchor.readAttribute('prompt');
    return message ? confirm(message) : true;
  }

};


LearnHub.SeeMoreLess = {

  init : function()
  {
    $$('.see-more-less-toggler li a').
      invoke('observe', 'click', this.toggleContainerThruEvent)
  },

  toggleContainerThruEvent : function(event)
  {
    var anchor = event.findElement('a');
    LearnHub.SeeMoreLess.toggle(anchor);
    event.stop();
  },

  toggle : function(anchor)
  {
    var toggler = anchor.up('.see-more-less-toggler');
    if (!toggler) return;
    var overflow_list = toggler.previous('.see-more-less-overflow-list');
    if (!overflow_list) return;
    if (overflow_list.visible()) {
      anchor.removeClassName('showing-more');
      anchor.addClassName('showing-less');
      overflow_list.blindUp({ duration : LH_EFFECT_DURATION });
    } else {
      anchor.removeClassName('showing-less');
      anchor.addClassName('showing-more');
      overflow_list.blindDown({ duration : LH_EFFECT_DURATION });
    }
  }

};


LearnHub.TabbedPanes = {

  init : function()
  {
    var anchors = $$('.tabbed-content-pane-anchor');
    if (anchors.size() == 0) return;
    anchors.invoke('observe', 'click', this.switchThruEvent);
    this.switchToPaneByAnchorName(Savvica.Utils.getDocumentHash());
  },

  switchThruEvent : function(event)
  {
    var anchor = event.findElement('a');
    LearnHub.TabbedPanes.switchToPaneByAnchorName(anchor.hash.gsub('#', ''));
    event.stop();
  },

  switchToPaneByAnchorName : function(name)
  {
    var pane_anchor = $$('a[name=' + name + ']')[0];
    var menu_anchor = $$('.tabbed-content-menu-list-item a[href=#' + name + ']')[0];
    if (!pane_anchor || !menu_anchor) return;
    var menu = menu_anchor.up('.tabbed-content-menu-list-item');
    var pane = pane_anchor.up('.tabbed-content-pane-container');
    LearnHub.TabbedPanes.switchToPane(pane);
    LearnHub.TabbedPanes.activateMenuItem(menu);
  },

  switchToPane : function(pane)
  {
    $$('.tabbed-content-pane-container').invoke('hide');
    pane.blindDown({ duration : LH_EFFECT_DURATION });
  },

  activateMenuItem : function(menu_item)
  {
    $$('.tabbed-content-menu-list-item').invoke('removeClassName', 'active');
    menu_item.addClassName('active');
  }

};


LearnHub.Dashboard = {

  init : function()
  {
    if (!$('user_dashboard_grid')) return;
    $$('a.dashboard-content-list-see-more-less-anchor').
      invoke('observe', 'click', this.toggleSeeMoreLess);
    $$('#user_update_form').
      invoke('observe', 'submit', this.submitUserUpdate);
  },

  toggleSeeMoreLess : function(event)
  {
    var anchor = event.findElement('a.dashboard-content-list-see-more-less-anchor');
    if (anchor.hasClassName('not-showing-more'))
      LearnHub.Dashboard.showMoreForAnchor(anchor);
    else
      LearnHub.Dashboard.showLessForAnchor(anchor);
    event.stop();
  },

  showMoreForAnchor : function(anchor)
  {
    anchor.removeClassName('not-showing-more');
    anchor.addClassName('showing-more');
    anchor.up().previous('.dashboard-content-list-overflow-container').
      slideDown({ duration : LH_EFFECT_DURATION });
  },

  showLessForAnchor : function(anchor)
  {
    anchor.removeClassName('showing-more');
    anchor.addClassName('not-showing-more');
    anchor.up().previous('.dashboard-content-list-overflow-container').
      slideUp({ duration : LH_EFFECT_DURATION });
  },

  submitUserUpdate : function(event)
  {
    var form = event.findElement('form');
    var textarea = $('user_update_body');
    var submit_button = $('user_update_form_submit_button');
    if ($F(textarea) != '') {
      submit_button.disabled = true;
      new Ajax.Request('/updates', {
        method : 'post',
        parameters : form.serialize(),
        onSuccess : function(tx) {
          textarea.value = '';
          $('latest_microblog_update').replace(tx.responseText);
          $('latest_microblog_update').highlight({
            startcolor : '#edf3fc',
            endcolor : '#d7e6fb'
          });
          LearnHub.HintedFields.doBlur(textarea);
          submit_button.disabled = false;
        },
        onFailure : function(tx) {
          alert('Unable to post your update at this time, try again later.');
          submit_button.disabled = false;
        }
      });
    }
    LearnHub.HintedFields.doBlur(textarea);
    event.stop();
  }

};


LearnHub.Time = {

  padZero : function(number)
  {
    return (number < 10) ? ('0' + number) : number;
  },

  toString : function(seconds)
  {
    var t = this.split(seconds);
    return [t[0], this.padZero(t[1]), this.padZero(t[2])].join(':');
  },

  split : function(seconds)
  {
    var secs = parseInt(seconds);
    var s = secs % 60;
    var m = Math.floor(secs / 60) % 60;
    var h = Math.floor(secs / 60 / 60) % 60;
    return [h, m, s];
  },

  splitSeconds : function(seconds)
  {
    t = this.split(seconds);
    return { 'hours' : t[0], 'minutes' : t[1], 'seconds' : t[2] };
  }

};


LearnHub.QuestionBank = {

  init : function()
  {
    if (!$('qb_question_timer')) return;
    new PeriodicalExecuter(LearnHub.QuestionBank.refreshTimers, 1);
  },

  refreshTimers : function()
  {
    if (LearnHub.QuestionBank.isPaused()) return;
    var total_time = LearnHub.QuestionBank.incrementTimer('trivia_answer_total_time');
    var question_time = LearnHub.QuestionBank.incrementTimer('question_time');
    LearnHub.QuestionBank.setTimerDisplay('question_bank_total_time', total_time);
    LearnHub.QuestionBank.setTimerDisplay('question_bank_question_time', question_time);
  },

  getCurrentTime : function(element)
  {
    return parseInt($(element).value);
  },

  setCurrentTime : function(element, new_time)
  {
    $(element).value = new_time;
  },

  setTimerDisplay : function(element, seconds)
  {
    var time = LearnHub.Time.splitSeconds(seconds);
    var padded_minutes = LearnHub.Time.padZero(time['minutes']);
    var padded_seconds = LearnHub.Time.padZero(time['seconds']);
    var formatted_time = (padded_minutes + ':' + padded_seconds);
    $(element).update(formatted_time);
  },

  incrementTimer : function(element)
  {
    var new_time = LearnHub.QuestionBank.getCurrentTime(element) + 1;
    LearnHub.QuestionBank.setCurrentTime(element, new_time);
    return new_time;
  },

  pause : function()
  {
    $('pause_game').value = 'true';
  },

  resume : function()
  {
    $('pause_game').value = 'false';
  },

  toggleTimer : function()
  {
    if (LearnHub.QuestionBank.isPaused())
      LearnHub.QuestionBank.resume();
    else
      LearnHub.QuestionBank.pause();
  },

  isPaused : function()
  {
    return $('pause_game').value == 'true';
  }
}


// Good chance that this and QuestionBank timer can be merged into a generic solution
// We'll keep it seperate until that's clear -- WM
LearnHub.Quiz = {

  init : function()
  {
    if (!$('test_base_time')) return;
    new PeriodicalExecuter(this.cycleTimer, 1);
    $('test_pause_resume_anchor').observe('click', this.pauseOrResumeViaEvent);
    this.resume();
  },

  cycleTimer : function()
  {
    if (LearnHub.Quiz.isPaused()) return;
    var new_time = (LearnHub.Quiz.getBaseTime() - 1);
    LearnHub.Quiz.setBaseTime(new_time);
    LearnHub.Quiz.updateClockDisplay(new_time);
    LearnHub.Quiz.updateClockStatus(new_time);
  },

  updateClockDisplay : function(seconds)
  {
    $('test_timer_clock').update(LearnHub.Time.toString(Math.abs(seconds)));
  },

  updateClockStatus : function(seconds)
  {
    if (!this.hasTimeLimit()) return;
    if (this.isPastTimeLimit()) {
      $('test_timer').addClassName('over-time-limit');
      $('test_timer').removeClassName('under-time-limit');
    } else {
      $('test_timer').addClassName('under-time-limit');
      $('test_timer').removeClassName('over-time-limit');
    }
  },

  isPastTimeLimit : function()
  {
    return this.hasTimeLimit() ? this.getBaseTime() < 0 : false;
  },

  pauseOrResumeViaEvent : function(event)
  {
    event.stop();
    LearnHub.Quiz.togglePauseResume();
  },

  togglePauseResume : function()
  {
    this.isPaused() ? this.resume() : this.pause();
  },

  getBaseTime : function()
  {
    return parseInt($F('test_base_time'));
  },

  setBaseTime : function(value)
  {
    $('test_base_time').value = value;
  },

  getTimeLimit : function()
  {
    if (!$('test_time_limit')) return 0;
    return parseInt($F('test_time_limit'));
  },

  hasTimeLimit : function()
  {
    return this.getTimeLimit() == 0 ? false : true;
  },

  isPaused : function()
  {
    return 'true' == $F('test_is_paused');
  },

  pause : function()
  {
    $('test_is_paused').value = 'true';
    $('test_timer').addClassName('is-paused');
    $('test_pause_resume_anchor').removeClassName('pause');
    $('test_pause_resume_anchor').addClassName('resume');
  },

  resume : function()
  {
    $('test_is_paused').value = 'false';
    $('test_timer').removeClassName('is-paused');
    $('test_pause_resume_anchor').removeClassName('resume');
    $('test_pause_resume_anchor').addClassName('pause');
  }

}


LearnHub.QuizForm = {

  init : function()
  {
    if(!$('evaluation_use_negative_marking')) return;
    $('evaluation_use_negative_marking').observe('change', function(event) {
      LearnHub.QuizForm.toggleNegativeMarks() });
    this.toggleNegativeMarks();
  },

  toggleNegativeMarks : function()
  {
    if($F('evaluation_use_negative_marking') == 'true') {
      $('negative_score_fields').show();
      return;
    }
    $('negative_score_fields').hide();
  }

}


LearnHub.QuizAnswers = {

  init : function()
  {
    if (!$('test_answers')) return;
    var anchors = $$('.evaluation-question-list-item-anchor');
    if (0 == anchors.size()) return;
    anchors.invoke('observe', 'click', this.switchThruEvent);
    $('next_answer_button').observe('click', this.next);
    $('previous_answer_button').observe('click', this.previous);
    $('test_results_summary_anchor').observe('click', this.switchToSummaryViaEvent);
    $('first_answer_button').observe('click', this.goToFirstAnswerViaEvent);
    this.switchToAnswerByAnchorName(Savvica.Utils.getDocumentHash());
  },

  switchThruEvent : function(event)
  {
    var anchor = event.findElement('a');
    LearnHub.QuizAnswers.switchToAnswerByAnchorName(anchor.hash.gsub('#', ''));
    event.stop();
  },

  switchToAnswerByAnchorName : function(name)
  {
    var answer_anchor = $$('a[name=' + name + ']')[0];
    var menu_anchor = $$('.quiz-question-list-item a[href=#' + name + ']')[0];
    if (!answer_anchor || !menu_anchor) return;
    var menu = menu_anchor.up('.quiz-question-list-item');
    var answer = answer_anchor.up();
    LearnHub.QuizAnswers.switchToAnswer(answer);
    LearnHub.QuizAnswers.activateMenuItem(menu);
  },

  switchToAnswer : function(answer)
  {
    $('test_answers').show();
    $('test_results_summary').hide();
    $$('.quiz-answer').invoke('hide');
    answer.show();
  },

  activateMenuItem : function(menu_item)
  {
    $$('.quiz-question-list-item').invoke('removeClassName', 'active');
    menu_item.addClassName('active');
  },

  switchToSummaryViaEvent : function(event)
  {
    event.stop();
    LearnHub.QuizAnswers.switchToSummary();
  },

  switchToSummary : function()
  {
    $$('.quiz-question-list-item').invoke('removeClassName', 'active');
    $('test_answers').hide();
    $('test_results_summary').show();
  },

  goToFirstAnswerViaEvent : function(event)
  {
    event.stop();
    var anchor = $$('.quiz-answer a[name]')[0];
    if (!anchor) return;
    LearnHub.QuizAnswers.switchToAnswerByAnchorName(anchor.readAttribute('name'));
  },

  next : function(event)
  {
    event.stop();
    $$('.quiz-answer').each(function(answer_container) {
      if (!answer_container.visible()) return;
      var next_container = answer_container.nextSiblings()[0];
      if (!next_container) return;
      var next_anchors = next_container.select('a[name]');
      if (typeof next_anchors[0] == 'undefined') {
        LearnHub.QuizAnswers.switchToSummary();
      } else {
        var name = next_anchors[0].name;
        LearnHub.QuizAnswers.switchToAnswerByAnchorName(name);
      }
      throw $break;
    });
  },

  previous : function(event)
  {
    event.stop();
    $$('.quiz-answer').each(function(answer_container) {
      if (!answer_container.visible()) return;
      var next_container = answer_container.previousSiblings()[0];
      if (!next_container) return;
      var next_anchors = next_container.select('a[name]');
      if (typeof next_anchors[0] == 'undefined') {
        LearnHub.QuizAnswers.switchToSummary();
      } else {
        var name = next_anchors[0].name;
        LearnHub.QuizAnswers.switchToAnswerByAnchorName(name);
      }
      throw $break;
    });
  }

}


LearnHub.QuizQuestions = {

  init : function()
  {
    if (!$('test_answer_choices_form')) return;
    var anchors = $$('.evaluation-question-list-item-anchor');
    if (0 == anchors.size()) return;
    anchors.invoke('observe', 'click', this.switchThruEvent);
    $('quiz_next_button').observe('click', this.next);
    $('quiz_previous_button').observe('click', this.previous);
    $('quiz_question_highlight_anchor').observe('click', this.highlight);
    this.switchToQuestionByAnchorName(Savvica.Utils.getDocumentHash());
    $('test_review_anchor').observe('click', this.switchToReviewViaEvent);
    this.hasLoaded();
  },

  hasLoaded : function()
  {
    $('test_loading_message').remove();
    $('test_question_fieldsets',
      'test_sidebar_controls').invoke('appear', { duration : 1.0 });
  },

  highlight : function(event)
  {
    event.stop();
    var current_anchor = LearnHub.QuizQuestions.currentQuestionAnchorName();
    if (!current_anchor) return;
    var menu = LearnHub.QuizQuestions.menuItemForQuestionAnchorName(current_anchor);
    menu.toggleClassName('highlight');
  },

  currentQuestionAnchorName : function()
  {
    var visible_question = $$('.attempted-quiz-question-fields').findAll(function(element) {
      return element.visible();
    })[0];
    if (!visible_question) return null;
    return visible_question.select('a[name]')[0].readAttribute('name');
  },

  switchThruEvent : function(event)
  {
    var anchor = event.findElement('a');
    LearnHub.QuizQuestions.switchToQuestionByAnchorName(anchor.hash.gsub('#', ''));
    event.stop();
  },

  switchToQuestionByAnchorName : function(name)
  {
    var question_anchor = $$('a[name=' + name + ']')[0];
    var menu_anchor = $$('.quiz-question-list-item a[href=#' + name + ']')[0];
    if (!question_anchor || !menu_anchor) return;
    var menu = menu_anchor.up('.quiz-question-list-item');
    var question = question_anchor.up();
    LearnHub.QuizQuestions.switchToQuestion(question);
    LearnHub.QuizQuestions.activateMenuItem(menu);
  },

  switchToQuestion : function(question)
  {
    LearnHub.Quiz.resume();
    $('test_question_fieldsets').show();
    $('test_review_message').hide();
    $$('.attempted-quiz-question-fields').invoke('hide');
    question.show();
    this.submitFormData();
  },

  submitFormData : function()
  {
    $('test_answer_choices_form').request();
  },

  menuItemForQuestionAnchorName : function(anchor_name)
  {
    var menu_anchor = $$('.quiz-question-list-item a[href=#' + anchor_name + ']')[0];
    return menu_anchor.up('.quiz-question-list-item');
  },

  markAsCompletedById : function(question_id)
  {
    var menu = this.menuItemForQuestionAnchorName('question_' + question_id);
    menu.addClassName('completed');
  },

  activateMenuItem : function(menu_item)
  {
    $$('.quiz-question-list-item').invoke('removeClassName', 'active');
    menu_item.addClassName('active');
  },

  switchToReviewViaEvent : function(event)
  {
    event.stop();
    LearnHub.QuizQuestions.switchToReview();
  },

  switchToReview : function()
  {
    LearnHub.Quiz.pause();
    $('test_question_fieldsets').hide();
    $('test_review_message').blindDown({ duration : LH_EFFECT_DURATION });
  },

  next : function(event)
  {
    event.stop();
    $$('.attempted-quiz-question-fields').each(function(question_container) {
      if (!question_container.visible()) return;
      var next_container = question_container.nextSiblings()[0];
      if (next_container.className != 'attempted-quiz-question-fields') {
        LearnHub.QuizQuestions.switchToReview();
      } else {
        var next_anchors = next_container.select('a');
        var name = next_anchors[0].name;
        LearnHub.QuizQuestions.switchToQuestionByAnchorName(name);
      }
      throw $break;
    });
  },

  previous : function(event)
  {
    event.stop();
    $$('.attempted-quiz-question-fields').each(function(question_container) {
      if (!question_container.visible()) return;
      var next_container = question_container.previousSiblings()[0];
      if (!next_container) return;
      var next_anchors = next_container.select('a');
      if (typeof next_anchors[0] == 'undefined') {
        LearnHub.QuizQuestions.switchToReview();
      } else {
        var name = next_anchors[0].name;
        LearnHub.QuizQuestions.switchToQuestionByAnchorName(name);
      }
      throw $break;
    });
  }

}


LearnHub.Search = {

  init : function()
  {
    if (!$('search_params')) return;
    var query = $('search_params').value;
    var sc = new GSearchControl();
    var ws = new GwebSearch();
    var op = new GdrawOptions();
    op.setDrawMode(GSearchControl.DRAW_MODE_TABBED);
    op.setSearchFormRoot($('search_form'));
    ws.setUserDefinedLabel('All of LearnHub');
    ws.setSiteRestriction('015734378844574746752:ltlscpgj0zo');
    sc.addSearcher(ws);
    sc.setLinkTarget(GSearch.LINK_TARGET_SELF);
    sc.setNoResultsString('No LearnHub pages were found matching your search.');
    sc.draw($('search_results'), op);
    sc.setResultSetSize(GSearch.LARGE_RESULTSET);
    sc.execute(query || '');
  }

}


LearnHub.PhotoAlbums = {

  init : function()
  {
    $$('.photo-album-remove-photo-anchor').
      invoke('observe', 'click', LearnHub.PhotoAlbums.removePhotoViaEvent);
  },

  removePhotoViaEvent : function(event)
  {
    var element = event.findElement('.photo-info-list-item');
    element.fade({ duration : LH_EFFECT_DURATION });
  }

}


LearnHub.InviteForms = {

  dirty_forms : $A(),
  fool_alerted : false,

  init : function()
  {
    $$('.invite-contact-item input').
      invoke('observe', 'change', LearnHub.InviteForms.toggleContactItemViaEvent);
    $$('.manual-invite-email-input').
      invoke('observe', 'change', LearnHub.InviteForms.showHideRows);
    LearnHub.InviteForms.startFoolProofer();
    $$('.invite-select-all-anchor').
      invoke('observe', 'click', LearnHub.InviteForms.selectAllContacts);
    $$('.invite-deselect-all-anchor').
      invoke('observe', 'click', LearnHub.InviteForms.deselectAllContacts);
  },

  selectAllContacts : function(event)
  {
    $$('.invite-contact-item').each(function(element) {
      element.down('input[type=checkbox]').checked = true;
      element.addClassName('selected');
    });
    event.stop();
  },

  deselectAllContacts : function(event)
  {
    $$('.invite-contact-item').each(function(element) {
      element.down('input[type=checkbox]').checked = false;
      element.removeClassName('selected');
    });
    event.stop();
  },

  startFoolProofer : function()
  {
    if (!$('invite_people_grid')) return;
    $$('form.invite-form').each(function(form) {
      new Form.Observer(form, 2.5, function(f, value) {
        if (LearnHub.InviteForms.dirty_forms.include(f)) return;
        LearnHub.InviteForms.dirty_forms.push(f);
        if (!LearnHub.InviteForms.fool_alerted && LearnHub.InviteForms.dirty_forms.size() > 1) {
          LearnHub.InviteForms.fool_alerted = true;
          alert('You have already entered data on another form, only the data ' +
                'on the form you submit will be processed.');
        }
      });
    });
  },

  showHideRows : function(event)
  {
    var rows = $$('.manual-invite-table-row');
    var index = LearnHub.InviteForms.lastDirtyRowIndex(rows);
    rows.invoke('hide');
    switch (index) {
    case -1:
    case 0:
      rows.slice(0, 3).invoke('show');
      break;
    default:
      rows.slice(0, index + 3).invoke('show');
      break;
    }
  },

  isRowDirty : function(row)
  {
    var field = row.down('.manual-invite-email-input');
    return $F(field).blank() || field.hasClassName('hinted') ? false : true;
  },

  lastDirtyRowIndex : function(rows)
  {
    return rows.inject(-1, function(memo, row, index) {
      if (LearnHub.InviteForms.isRowDirty(row))
        return index;
      else
        return memo;
    });
  },

  toggleContactItemViaEvent : function(event)
  {
    var check_box = event.findElement('input');
    LearnHub.InviteForms.toggleContactItem(check_box);
  },

  toggleContactItem : function(check_box)
  {
    if (check_box.checked)
      check_box.up('.invite-contact-item').addClassName('selected');
    else
      check_box.up('.invite-contact-item').removeClassName('selected');
  }

}


LearnHub.TriviaQuestionForm = {

  init : function()
  {
    if (!$('trivia_question_edit_anchor')) return;
    $('trivia_question_edit_anchor').
      observe('click', LearnHub.TriviaQuestionForm.switchToEdit);
    $('trivia_question_preview_anchor').
      observe('click', LearnHub.TriviaQuestionForm.switchToPreview);
    $('trivia_question_form').
      observe('submit', LearnHub.TriviaQuestionForm.checkIsPublished);
  },

  checkIsPublished : function(event)
  {
    if ($('trivia_question_published_true').checked) return;
    var confirm_text = 'Are you sure you want to save this Trivia Question ' +
      'without publishing it? Nobody will be able to see it until it is ' +
      'published.';
    if (!confirm(confirm_text)) event.stop();
  },

  switchToEdit : function(event)
  {
    LearnHub.TriviaQuestionForm.hidePreview();
    LearnHub.TriviaQuestionForm.showEdit();
    event.stop();
  },

  switchToPreview : function(event)
  {
    LearnHub.TriviaQuestionForm.hideEdit();
    LearnHub.TriviaQuestionForm.showPreview();
    LearnHub.TriviaQuestionForm.refreshPreview();
    event.stop();
  },

  refreshPreview : function()
  {
    LearnHub.TriviaQuestionForm.clearPreview();
    LearnHub.TriviaQuestionForm.reloadPreviewQuestion();
    LearnHub.TriviaQuestionForm.reloadPreviewChoices();
  },

  clearPreview : function()
  {
    $('trivia_question_choices_table').update('');
    $('trivia_question_preview_question_text').update('');
    var explanation_preview = $('trivia_question_preview_question_explanation');
    if (explanation_preview) explanation_preview.update('');
  },

  createPreviewChoice : function(textile)
  {
    html = [
      '<tr>',
        '<td class="choice-radio-cell" align="center" valign="middle">',
          '<input name="preview_choice" type="radio" value="" />',
        '</td>',
        '<td class="choice-text-cell">',
          '<label class="trivia-question-preview-choice-label">',
            '#{content}',
          '</label>',
        '</td>',
      '</tr>'
    ].join('');
    return html.interpolate({ 'content': textile });
  },

  reloadPreviewQuestion : function()
  {
    var text_area = $$('.trivia-question-text-area')[0];
    if ($F(text_area).blank()) {
      $('nothing_to_preview_message').show();
      $('trivia_question_preview_content_block').hide();
    } else {
      $('nothing_to_preview_message').hide();
      $('trivia_question_preview_content_block').show();
      $('trivia_question_preview_question_text').update($F(text_area))
      LearnHub.Textile.updateElementWithTextile('trivia_question_preview_question_text', $F(text_area));
    }
  },

  reloadPreviewChoices : function()
  {
    var html = $$('.trivia-question-choice-text-field').inject([], function(array, element) {
      if ($F(element).blank()) return array;
      array.push(LearnHub.TriviaQuestionForm.createPreviewChoice($F(element)));
      return array;
    }).join("\n");
    $('trivia_question_choices_table').update(html);
    $$('.trivia-question-preview-choice-label').each(function(element) {
      LearnHub.Textile.updateElementWithTextile(element, element.innerHTML);
    });
  },

  hideEdit : function()
  {
    $('trivia_question_edit_anchor').up('li').removeClassName('active');
    $('trivia_question_edit_pane').hide();
  },

  showEdit : function()
  {
    $('trivia_question_edit_anchor').up('li').addClassName('active');
    $('trivia_question_edit_pane').show();
  },

  hidePreview : function()
  {
    $('trivia_question_preview_anchor').up('li').removeClassName('active');
    $('trivia_question_preview_pane').hide();
  },

  showPreview : function()
  {
    $('trivia_question_preview_anchor').up('li').addClassName('active');
    $('trivia_question_preview_pane').show();
  }

};


LearnHub.ColorPalette = {

  init : function()
  {
    $$('.color-palette-swatch-color').
      invoke('observe', 'click', LearnHub.ColorPalette.selectSwatchViaEvent);
  },

  selectSwatch : function(element)
  {
    LearnHub.ColorPalette.unselectAllSwatches();
    element.addClassName('selected');
    element.adjacent('input[type=radio]')[0].checked = true;
  },

  selectSwatchViaEvent : function(event)
  {
    var element = event.findElement('.color-palette-swatch-color');
    LearnHub.ColorPalette.selectSwatch(element);
  },

  unselectAllSwatches : function()
  {
    $$('.color-palette-swatch-color').
      invoke('removeClassName', 'selected');
  }

};


LearnHub.WorkspaceLayout = {

  block_types : $w('feature_list_block feature_block discussion_block ' +
    'lesson_block trivia_block test_block member_block photo_gallery_block ' +
    'location_block event_block news_block'),

  single_block_types : $w('discussion_block lesson_block trivia_block ' +
    'test_block member_block photo_gallery_block location_block event_block'),

  init : function()
  {
    if (!$('add_layout_block_select')) return;
    LearnHub.WorkspaceLayout.ProxyLists.init();
    LearnHub.WorkspaceLayout.Proxies.init();
    LearnHub.WorkspaceLayout.ProxyTrash.init();
    LearnHub.WorkspaceLayout.LayoutBlockSpawner.init();
  },

  reload : function()
  {
    LearnHub.WorkspaceLayout.ProxyLists.init();
    LearnHub.WorkspaceLayout.Proxies.init();
  }

};


LearnHub.WorkspaceLayout.LayoutBlockSpawner = {

  init : function()
  {
    $('add_layout_block_select').observe('change', function(event) {
      var value = event.findElement('select').value;
      LearnHub.WorkspaceLayout.LayoutBlockSpawner.select(value);
    });
  },

  select : function(block_type)
  {
    LearnHub.WorkspaceLayout.LayoutBlockSpawner.hideAllDescriptions();
    var desc = LearnHub.WorkspaceLayout.LayoutBlockSpawner.blockDescriptionFromType(block_type);
    if (desc) desc.show();
  },

  blockDescriptions : function()
  {
    return LearnHub.WorkspaceLayout.block_types.inject($A(), function(elements, block_type) {
      var desc = LearnHub.WorkspaceLayout.LayoutBlockSpawner.blockDescriptionFromType(block_type);
      if (desc) elements.push(desc);
      return elements;
    });
  },

  blockDescriptionFromType : function(block_type)
  {
    return $(block_type + '_description');
  },

  hideAllDescriptions : function()
  {
    LearnHub.WorkspaceLayout.LayoutBlockSpawner.blockDescriptions().invoke('hide');
  }

};


LearnHub.WorkspaceLayout.ProxyTrash = {

  init : function()
  {
    Droppables.add('proxy_removal_block', {
      accept : 'content-block-proxy-item',
      hoverclass : 'active',
      onDrop : function(element) {
        LearnHub.WorkspaceLayout.Proxies.remove(element);
      }
    });
  }

};


LearnHub.WorkspaceLayout.ProxyLists = {

  list_ids: $w('layout_left_column_proxy_list layout_right_column_proxy_list'),

  init : function()
  {
    LearnHub.WorkspaceLayout.ProxyLists.list_ids.each(function(id) {
      Sortable.create(id, {
        constraint : false,
        containment : LearnHub.WorkspaceLayout.ProxyLists.list_ids,
        dropOnEmpty : true,
        onUpdate : LearnHub.WorkspaceLayout.ProxyLists.updateFormElements
      });
    });
  },

  updateFormElements : function(element)
  {
    LearnHub.WorkspaceLayout.ProxyLists.list_ids.each(function(id) {
      $$('#' + id + ' .content-block-proxy-item').each(function(proxy, index) {
        if ('layout_left_column_proxy_list' == id)
          proxy.down('.proxy-column-left-radio').checked = true;
        else
          proxy.down('.proxy-column-right-radio').checked = true;
        proxy.down('.proxy-position-textbox').writeAttribute('value', index);
      });
    });
  },

  columnIdForProxyListId : function(list_id)
  {
    return $H({
      'layout_left_column_proxy_list': '0',
      'layout_right_column_proxy_list': '1'
    }).get(list_id);
  }

};


LearnHub.WorkspaceLayout.Proxies = {

  init : function()
  {
    $$('.content-block-proxy-item').
      invoke('observe', 'click', LearnHub.WorkspaceLayout.Proxies.selectViaEvent)
  },

  unselectAll : function()
  {
    $$('.content-block-proxy-item').invoke('removeClassName', 'selected');
  },

  selectViaEvent : function(event)
  {
    LearnHub.WorkspaceLayout.Proxies.select(event.findElement('li'));
  },

  select : function(proxy)
  {
    if ($(proxy).hasClassName('removed')) return;
    LearnHub.WorkspaceLayout.Proxies.unselectAll();
    LearnHub.WorkspaceLayout.Associates.hideAll();
    $(proxy).addClassName('selected');
    LearnHub.WorkspaceLayout.Associates.selectViaProxy($(proxy));
  },

  remove : function(proxy)
  {
    proxy = $(proxy);
    proxy.hide();
    LearnHub.WorkspaceLayout.Associates.hideViaProxy(proxy);
    proxy.down('.proxy-remove-checkbox').writeAttribute('checked', 'checked');
    proxy.addClassName('removed');
  }

};


LearnHub.WorkspaceLayout.Associates = {

  getViaProxy : function(proxy)
  {
    var object_id = proxy.readAttribute('objectid');
    var options_id = 'content_block_options_' + object_id;
    var preview_id = 'content_block_preview_' + object_id;
    return $(options_id, preview_id).compact();
  },

  selectViaProxy : function(proxy)
  {
    LearnHub.WorkspaceLayout.Associates.getViaProxy(proxy).invoke('show');
  },

  hideViaProxy : function(proxy)
  {
    LearnHub.WorkspaceLayout.Associates.getViaProxy(proxy).invoke('hide');
  },

  hideAll : function()
  {
    $$('.content-block-options-block', '.content-block-preview-block').
      invoke('hide');
  }

};


LearnHub.WorkspaceLayout.FeatureBlock = {

  watch : function(block_id)
  {
    var freq = 2; // every 2 seconds
    new Form.Element.Observer('workspace_layout_blocks['+block_id+'][content_item]', freq, function(element, value) {
      var id = element.id.match(/\[(\d*)\]/)[1];
      var title = $('workspace_layout_blocks['+id+'][content_item]').select('option[value="'+value+'"]')[0].innerHTML;
      $('content_block_preview_'+id).select('.featured-content-item-info-title h4')[0].update('<a>'+title+'</a>');
      var content_type = value.split(/:/)[0];
      $('content_block_preview_'+id).select('.featured-content-item-info-type')[0].update(content_type);
    });
    new Form.Element.Observer('workspace_layout_blocks_'+block_id+'_title', freq, function(element, value) {
      var id = element.id.match(/_(\d*)_/)[1];
      $('content_block_preview_'+id).select('.content-block-title-caption h3')[0].update(value)
    });
    new Form.Element.Observer('workspace_layout_blocks_'+block_id+'_description', freq, function(element, value) {
      var id = element.id.match(/_(\d*)_/)[1];
      $('content_block_preview_'+id).select('.featured-content-item-info-body p')[0].update(value)
    });
  }

};


LearnHub.Dropdowns = {

  timers : {},
  captions : null,
  menus : null,
  parent_menu_items : null,

  init : function()
  {
    if ($('ie6_blows')) return LearnHub.Dropdowns.IE6.init();
    this.parent_menu_items = $$('.menu-item.dropdown');
    this.parent_menu_items.invoke('addClassName', 'initialized');
    this.captions = $$('.menu-item.dropdown .menu-item-caption');
    this.captions.invoke('observe', 'mouseover', this.mouseOnCaption);
    this.captions.invoke('observe', 'mouseout', this.mouseOffCaption);
    this.menus = $$('.menu-item.dropdown .dropdown-menu-list');
    this.menus.invoke('observe', 'mouseover', this.mouseOnMenu);
    this.menus.invoke('observe', 'mouseout', this.mouseOffMenu);
  },

  mouseOnMenu : function(event)
  {
    LearnHub.Dropdowns.stopTimer('off_dropdown');
    event.findElement('.menu-item').addClassName('mouse-on');
  },

  mouseOffMenu : function(event)
  {
    LearnHub.Dropdowns.startTimer('off_dropdown', function() {
      event.findElement('.menu-item').removeClassName('mouse-on');
    });
  },

  mouseOnCaption : function(event)
  {
    var menu_item = event.findElement('.menu-item');
    LearnHub.Dropdowns.stopTimer('off_dropdown')
    if (!menu_item.hasClassName('mouse-on')) LearnHub.Dropdowns.resetState();
    LearnHub.Dropdowns.startTimer('on_caption', function() {
      menu_item.addClassName('mouse-on');
    });
  },

  mouseOffCaption : function(event)
  {
    LearnHub.Dropdowns.stopTimer('on_caption');
    event.findElement('.menu-item').removeClassName('mouse-on');
  },

  resetState : function()
  {
    LearnHub.Dropdowns.menus.invoke('hide');
    LearnHub.Dropdowns.parent_menu_items.invoke('removeClassName', 'mouse-on');
  },

  startTimer : function(name, funct)
  {
    LearnHub.Dropdowns.timers[name] = window.setTimeout(funct, 250);
  },

  stopTimer : function(name)
  {
    window.clearTimeout(LearnHub.Dropdowns.timers[name]);
  }

};


// IE6 gets it's own special version of dropdown menus, because I can't be
// bothered with it's quirky bullshit anymore. -- CKN
LearnHub.Dropdowns.IE6 = {

  init : function()
  {
    var dropdowns = $$('.menu-item.dropdown');
    dropdowns.invoke('observe', 'mouseover', this.mouseOn);
    dropdowns.invoke('observe', 'mouseout', this.mouseOff);
  },

  mouseOn : function(event)
  {
    event.findElement('.menu-item').addClassName('mouse-on');
  },

  mouseOff : function(event)
  {
    event.findElement('.menu-item').removeClassName('mouse-on');
  }

}


LearnHub.ColumnSets = {

  normalize : function()
  {
    $$('.column_set').each(function(column_set) {
      var columns = column_set.select('.column');
      Savvica.Utils.normalizeHightOfElements(columns);
    });
  }

}


LearnHub.EnforceTextAreaLimit = {

  init : function()
  {
    $$('textarea.content_length_200').each(function(element, index) {
      element.onkeyup = function() {
        if (this.value.length > 200) this.value = this.value.substring(0, 200);
      };
    });

    $$('textarea.content_length_1000').each(function(element, index) {
      element.onkeyup = function() {
        if (this.value.length > 1000) this.value = this.value.substring(0, 1000);
      };
    });
  }

}


LearnHub.SignInSignUp = {

  init : function()
  {
    $$('#sign_in_anchor').invoke('observe', 'click', function(event) {
      $('sign_up_form_content_block').hide();
      $('sign_in_form_content_block').show();
      event.stop();
    });
    $$('#sign_up_anchor').invoke('observe', 'click', function(event) {
      $('sign_up_form_content_block').show();
      $('sign_in_form_content_block').hide();
      event.stop();
    });
  }

};


LearnHub.HintedFields = {

  init : function()
  {
    $$('input[hint]', 'textarea[hint]').each(function(element) {
      element.observe('blur', LearnHub.HintedFields.doBlurEvent);
      element.observe('focus', LearnHub.HintedFields.doFocusEvent);
      var caption = $F(element);
      var hint = element.readAttribute('hint');
      if (caption == '' || caption == hint)
        LearnHub.HintedFields.setHintedState(element);
    });
    $$('form').invoke('observe', 'submit', function(event) {
      var form = event.findElement('form');
      form.select('input[hint]', 'textarea[hint]').each(function(element) {
        var value = $F(element);
        var hint = element.readAttribute('hint');
        if (value == hint) element.value = '';
      });
    });
  },

  blurAll : function()
  {
    $$('input[hint]', 'textarea[hint]').each(function(element) {
      LearnHub.HintedFields.doBlur(element);
    });
  },

  doBlurEvent : function(event)
  {
    var element = (event.findElement('input') || event.findElement('textarea'));
    LearnHub.HintedFields.doBlur(element);
  },

  doBlur : function(element)
  {
    var caption = $F(element);
    var hint = element.readAttribute('hint');
    if (caption == '' || caption == hint)
      LearnHub.HintedFields.setHintedState(element);
  },

  doFocusEvent : function(event)
  {
    var element = (event.findElement('input') || event.findElement('textarea'));
    var caption = $F(element);
    var hint = element.readAttribute('hint');
    if (caption == '' || caption == hint)
      LearnHub.HintedFields.removeHintedState(element);
  },

  setHintedState : function(element)
  {
    element.addClassName('hinted');
    element.value = element.readAttribute('hint');
  },

  removeHintedState : function(element)
  {
    element.removeClassName('hinted');
    element.value = '';
  }

};


LearnHub.HomepageBelt = new function() {

  this.init = function()
  {
    $$('#homepage_belt_category_titles li a').
      invoke('observe', 'click', switchPane);
  }

  function switchPane(event)
  {
    var anchor = event.findElement('a');
    setActiveStyle(anchor);
    setActivePane(anchor);
    event.stop();
  }

  function setActiveStyle(anchor_element)
  {
    $$('#homepage_belt_category_titles li').
      invoke('removeClassName', 'selected');
    anchor_element.up().addClassName('selected');
  }

  function setActivePane(anchor_element)
  {
    $$('#homepage_belt_notable_object_lists_container .notable-object-list-block').
      invoke('hide');
    $(anchor_element.id.gsub('anchor', 'pane')).appear({ duration : LH_EFFECT_DURATION });
  }

};


LearnHub.HrefAppend = new function() {

  this.init = function()
  {
    if (!$('require_href_append')) return;
    var d = gup('d');
    if (d != '1') return false;
    var links = document.links;
    for (var i = 0; i < links.length; i++) {
      var currentLink = links[i];
      var linkHref = currentLink.href;
      if (linkHref.match(/learnhub/)) currentLink.href = append(linkHref);
    }
  }

  function append(url) {
    if (url.indexOf('?') > 0)
      return url + '&d=1';
    else
      return url + '?d=1';
  }

  function gup(name)
  {
    var name = name.replace(/[\[]/,'\\\[').replace(/[\]]/,'\\\]');
    var regexS = '[\\?&]' + name + '=([^&#]*)';
    var regex = new RegExp(regexS);
    var results = regex.exec(window.location.href);
    if (results == null)
      return '';
    else
      return results[1];
  }

};


LearnHub.ViewCount = new function() {

  this.init = function()
  {
    if (!$('view_count_url')) return;
    new Ajax.Request($('view_count_url').value, { method : 'post' });
  }

};


LearnHub.Courses = new function() {

  this.init = function()
  {
    if (!$('course_curriculum')) return;
    Sortable.create('course_curriculum', {
      dropOnEmpty : true,
      containment : ['course_curriculum', 'available_content']
    });
    Sortable.create('available_content', {
      dropOnEmpty : true,
      containment : ['course_curriculum', 'available_content']
    });
  }

  this.updateOrder = function()
  {
    s = [];
    $A($('course_curriculum').childNodes).each(function(node) {
      s.push(node.childNodes[0].id);
    });
    $('course_curriculum_objects').value = s.join(';');
  }

};


Savvica = {};
Savvica.Widgets = {};

Savvica.Forms = {};
Savvica.Forms.Publishing = {

  init : function()
  {
    if (!$('share_state')) return;
    $('share_state').onchange = function() {
      Savvica.Forms.Publishing.evaluate() };
    this.evaluate();
  },

  evaluate : function()
  {
    this._showMessage($('share_state').value);
    this._showAreas($('share_state').value);
    this._showHideLicense($('share_state').value);
  },

  _showMessage : function(state)
  {
    $('unshared_message',
      'public_message',
      'private_message'
    ).invoke('hide');
    $(state + '_message').show();
  },

  _showHideLicense : function(state)
  {
    if ($('licensing')) {
      switch (state) {
      case 'public':
        // Follow through to private...
      case 'private':
        $('licensing').show();
        break;
      default:
        $('licensing').hide();
        break;
      }
    }
  },

  _showAreas : function(state)
  {
    $('community_selector',
      'course_selector',
      'organization_selector'
    ).invoke('hide');
    switch (state) {
    case 'public':
      $('community_selector',
        'course_selector',
        'organization_selector'
      ).invoke('show');
      break;
    case 'private':
      $('course_selector',
        'organization_selector'
      ).invoke('show');
      break;
    }
  }

};


Savvica.Forms.Licensing = {

  init : function()
  {
    if (!$('content_has_license')) return;
    $('license').onchange = function() {
      Savvica.Forms.Licensing.evaluate() };
    this.evaluate();
  },

  evaluate : function()
  {
    this._showDescription( $('license').value );
  },

  _showDescription : function(license)
  {
    $('pd',
      'c',
      'by-nc-sa',
      'by-nc',
      'by-nc-nd',
      'by',
      'by-sa',
      'by-nd'
    ).invoke('hide');
    switch (license) {
    case 'Public-Domain':
      $('pd').show();
      break;
    case 'Attribution-NonCommercial-ShareAlike':
      $('by-nc-sa').show();
      break;
    case 'Attribution-NonCommercial':
      $('by-nc').show();
      break;
    case 'Attribution-NonCommercial-NoDerivs':
      $('by-nc-nd').show();
      break;
    case 'Attribution':
      $('by').show();
      break;
    case 'Attribution-ShareAlike':
      $('by-sa').show();
      break;
    case 'Attribution-NoDerivs':
      $('by-nd').show();
      break;
    default:
      $('c').show();
      break;
    }
  }

};


Savvica.Forms.AccountNotifications = {

  evaluateState : function()
  {
    if (!$('user_accept_activity_alerts')) return;
    if ($('user_accept_activity_alerts').checked) {
      $('not_receiving_notifications').hide();
      $('notification_intervals').show();
    } else {
      $('notification_intervals').hide();
      $('not_receiving_notifications').show();
    }
  }

};


Savvica.Forms.Compass = {

  init : function()
  {
    if ($('country')) {
      $('country').onchange = this.evaluateState;
      this.evaluateState();
    }
    if ($('add_more_phone2')) {
      $('add_more_phone2').observe('click', this.add_more_phone2);
      this.show_phone_numbers();
    }
    if ($('add_more_score')) {
      $('add_more_score').onclick = this.add_more_score;
      this.show_more_score();
    }
    if ($('add_more_academic_score')) {
      $('add_more_academic_score').onclick = this.add_more_academic_score;
      this.show_more_academic_score();
    }
  },

  add_more_academic_score : function() {
    $('more_academic_score_set').show();
    $('add_more_academic_score').hide();
    $('more_academic_score_value').disabled = '';
  },

  show_more_academic_score : function() {
    if ($('more_academic_score_value').value.length == 0) {
      $('more_academic_score_set').hide();
      $('more_academic_score_value').disabled = 'disabled';
    } else {
      $('add_more_academic_score').hide();
      $('more_academic_score_value').disabled = '';
    }
  },

  add_more_score : function() {
    $('more_score_set').show();
    $('add_more_score').hide();
    $('more_score_value').disabled = '';
  },

  show_more_score : function() {
    if ($('more_score_value').value.length == 0) {
      $('more_score_set').hide();
      $('more_score_value').disabled = 'disabled';
    } else {
      $('add_more_score').hide();
      $('more_score_value').disabled = '';
    }
  },

  add_more_phone2 : function(event)
  {
    event.stop();
    $('phone_number3_set').show();
    $('add_more_phone2').hide();
    $('phone_number3_value').disabled = '';
  },

  show_phone_numbers : function()
  {
    if ($('phone_number3_value').value.length == 0) {
      $('phone_number3_set').hide();
      $('phone_number3_value').disabled = 'disabled';
    } else {
      $('add_more_phone2').hide();
      $('phone_number3_value').disabled = '';
    }
  },

  evaluateState : function()
  {
    switch($('country').value) {
    case 'India':
      if ($('address_set'))
        $('address_set').show();
      $('province_set').show();
      if ($('postal_code_set')) {
        $('postal_code_set').show();
        $('postcode_label').hide();
        $('zipcode_label').hide();
        $('pincode_label').show();
      }
      $('province_label').hide();
      $('state_label').show();
      break;
    case 'United States':
      if ($('address_set'))
        $('address_set').show();
      $('province_set').show();
      if ($('postal_code_set')) {
        $('postal_code_set').show();
        $('postcode_label').hide();
        $('zipcode_label').show();
        $('pincode_label').hide();
      }
      $('province_label').hide();
      $('state_label').show();
      break;
    default:
      if ($('address_set'))
        $('address_set').show();
      $('province_set').show();
      if ($('postal_code_set')) {
        $('postal_code_set').show();
        $('postcode_label').show();
        $('zipcode_label').hide();
        $('pincode_label').hide();
      }
      $('province_label').show();
      $('state_label').hide();
      break;
    }
  }

};


Savvica.Forms.FoldableFieldsets = {

  init : function() {
    $$('.foldable_section').each(function(section) {
      var checkbox = this.checkboxForFieldset(section);
      checkbox.onchange = this.__stateEval;
      checkbox.onchange();
    }.bind(this));
  },

  checkboxForFieldset : function(fieldset) {
    return fieldset.down('input[type=checkbox]');
  },

  foldableContainerForCheckbox : function(checkbox) {
    return checkbox.up('.foldable_section').down('.foldable_content');
  },

  __stateEval : function() {
    var container = Savvica.Forms.FoldableFieldsets.foldableContainerForCheckbox(this);
    if (this.checked) {
      container.show();
    } else {
      container.hide();
    }
  }

};


Savvica.Utils = {

  getDocumentHash : function()
  {
    var hash = document.location.hash;
    var name = (typeof hash == 'string') ? hash.gsub('#', '') : '';
    return name.blank() ? null : name;
  },

  normalizeHightOfElements : function(elements)
  {
    var max_height = elements.invoke('getHeight').max();
    elements.invoke('setStyle', {'height' : (max_height + 'px')});
  },

  // Takes a string such as 'Carsten is Cool and Smart!' and tokenizes it to look
  // something like: 'carsten_is_cool_and_smart'
  tokenizeString : function(string, whitespace_replace_char)
  {
    if (!whitespace_replace_char) whitespace_replace_char = '-';
    return string.strip().match(/[a-zA-Z0-9\s]*/)[0].gsub(/\s/, whitespace_replace_char).toLowerCase()
  },

  // TODO: This is some ugly code I found on the net that allows the insertion
  // of text at the caret position in a textarea.
  insertAtCaret : function(obj, text)
  {
    if (document.selection) {
      obj.focus();
      var orig = obj.value.replace(/\r\n/g, "\n");
      var range = document.selection.createRange();
      if (range.parentElement() != obj) return false;
      range.text = text;
      var actual = tmp = obj.value.replace(/\r\n/g, "\n");
      for (var diff = 0; diff < orig.length; diff++) {
        if (orig.charAt(diff) != actual.charAt(diff)) break;
      }
      for (var index = 0, start = 0;
        tmp.match(text)
          && (tmp = tmp.replace(text, ""))
          && index <= diff;
        index = start + text.length
      ) {
        start = actual.indexOf(text, index);
      }
    } else if (obj.selectionStart) {
      var start = obj.selectionStart;
      var end   = obj.selectionEnd;
      obj.value = obj.value.substr(0, start)
        + text
        + obj.value.substr(end, obj.value.length);
    }
    if (start != null) {
      this.setCaretTo(obj, start + text.length);
    } else {
      obj.value += text;
    }
  },

  // See above... -- CKN
  setCaretTo : function(obj, pos)
  {
    if (obj.createTextRange) {
      var range = obj.createTextRange();
      range.move('character', pos);
      range.select();
    } else if (obj.selectionStart) {
      obj.focus();
      obj.setSelectionRange(pos, pos);
    }
  }

};


Savvica.Effects = {

  flashHighlight : function(element, times_to_flash, options_for_highlight_effect)
  {
    if (!options_for_highlight_effect) options_for_highlight_effect = {};
    if (!times_to_flash) times_to_flash = 3;
    new Effect.Highlight(element, options_for_highlight_effect);
  }

};


Savvica.Widgets.NotificationArea = {

  displayEvent : function(message)
  {
    this._display(message, 'event');
  },

  displayStatus : function(message)
  {
    this._display(message, 'status');
  },

  hideStatus : function()
  {
    $('notification_area_caption').hide();
    $('notification_area_indicator').hide();
  },

  _display : function(message, type)
  {
    if (type == 'status'){
      $('notification_area_indicator').show();
      $('notification_area_caption').update(message + '&hellip;');
      $('notification_area_caption').show();
    } else {
      $('notification_area_indicator').hide();
      $('notification_area_caption').update(message);
      $('notification_area_caption').show();
      new Effect.Highlight('notification_area', {
        startcolor : '#e0ff63',
        endcolor : '#ffffff',
        restorecolor : '#ffffff',
        duration : 1 });
      new Effect.Fade('notification_area_caption', { 'delay' : 2 });
    }
  }

};


LearnHub.Compass = {};
LearnHub.Compass.Invoice = {

  init : function()
  {
    $$('#compass_invoice_monthly_limit').
      invoke('observe', 'change', this.updateTotalViaEvent);
  },

  updateTotalViaEvent : function(event)
  {
    var monthly_limit = $('compass_invoice_monthly_limit').value;
    var price = $('price').value;
    var tax = $('tax').value;
    $('total_amount').value = (monthly_limit * price * (1 + tax / 100)).toFixed(2);
  }

};


Savvica.Widgets.Courses = {

  change_scheduled_type : function(type)
  {
    Savvica.Widgets.Courses.hide_help();
    Savvica.Widgets.Courses.show_help(type);
    Savvica.Widgets.Courses.hide_fields();
    Savvica.Widgets.Courses.show_field(type);
  },

  hide_help : function()
  {
    $('schedule_type_scheduled_help').hide();
    $('schedule_type_open_help').hide();
    $('schedule_type_rolling_help').hide();
  },

  show_help : function(type)
  {
    $('schedule_type_' + type.toLowerCase() + '_help').show();
  },

  hide_fields : function()
  {
    $('schedule_type_scheduled_fields').hide();
    $('schedule_type_open_fields').hide();
    $('schedule_type_rolling_fields').hide();
  },

  show_field : function(type)
  {
    $('schedule_type_' + type.toLowerCase() + '_fields').show();
  }

};


Savvica.Widgets.Courses = {

  publish : function(state) {
    if ('true' == state)
      $('course_invites').show();
    else
      $('course_invites').hide();
  }

};


Savvica.Widgets.Posts = {

  // This does the quote postback thing in discussions. -- CKN
  quote : function(post_id, dom_id)
  {
    var prefix = dom_id ? (dom_id + '_') : '';
    $(prefix + 'post_reply_to_id').value = $(post_id).getAttribute('post_id');
    $(prefix + 'quoted_text').update($(post_id).getAttribute('postback'));
    $(prefix + 'discussion_reply_form').scrollTo();
    $(prefix + 'quote_text').show()
  },

  unquote : function(dom_id)
  {
    var prefix = dom_id ? (dom_id + '_') : '';
    $(prefix + 'post_reply_to_id').value = '';
    $(prefix + 'quoted_text').update('');
    $(prefix + 'quote_text').hide();
  },

  showSendingMessage : function(dom_id)
  {
    var prefix = dom_id ? (dom_id + '_') : '';
    this.hideMessages(dom_id);
    $(prefix + 'error_messages_for_post').update('');
    $(prefix + 'post_sending_message').show();
  },

  showSentMessage : function(dom_id)
  {
    var prefix = dom_id ? (dom_id + '_') : '';
    Savvica.Widgets.Posts.unquote(dom_id);
    $(prefix + 'post_body').value = '';
    this.hideMessages(dom_id);
    $(prefix + 'post_sent_message').show();
    new Effect.Highlight(prefix + 'post_sent_message');
    new Effect.Fade(prefix + 'post_sent_message', {
      'duration' : 7.0,
      'queue' : 'end',
      afterFinish : function() { $(prefix + 'post_default_message').show(); }
    });
  },

  showErrorMessage : function(dom_id)
  {
    var prefix = dom_id ? (dom_id + '_') : '';
    this.hideMessages(dom_id);
    $(prefix + 'post_error_message').show();
    new Effect.Highlight(prefix + 'post_error_message');
  },

  hideMessages : function(dom_id)
  {
    var prefix = dom_id ? (dom_id + '_') : '';
    $(prefix + 'post_sending_message').hide();
    $(prefix + 'post_error_message').hide();
    $(prefix + 'post_sent_message').hide();
    $(prefix + 'post_default_message').hide();
  },

  resetMessages : function(dom_id)
  {
    prefix = dom_id ? (dom_id + '_') : '';
    this.hideMessages(dom_id);
    $(prefix + 'post_default_message').show();
  }

};


Savvica.Widgets.Questions = {

  remove : function(question_identity, id, url)
  {
    $('question_' + question_identity).remove();
    if (id) new Ajax.Request(url, { method : 'post' });
  }

};


Savvica.Schools = {

  list : null,
  load : function(options) {
    if (Savvica.Schools.list != null) return;
    new Ajax.Request('/schools/js/list', {
      method : 'post',
      asynchronous : false
    });
  }

};


// Oh god... -- CKN
Savvica.Widgets.Testimonials = {

  init_auto_complete : function(form_identity, type) {
    new Autocompleter.Local('user_'+type+'_testimonial_records__'+type+'_testimonial_'+form_identity+'_name', 'testimonial_'+form_identity+'_autocomplete', Savvica.Schools.list, {});
  },

  remove : function(testimonial_identity, id, url)
  {
    $('testimonial_' + testimonial_identity).remove();
    if (id) new Ajax.Request(url, { method : 'post' });
  }

};


Savvica.Widgets.Attachments = {

  remove : function(id, url)
  {
    $('attachment_' + id).remove();
    new Ajax.Request(url, { method : 'post' });
  }

};


Savvica.Widgets.Choices = {

  remove : function(choice_identity, id, url)
  {
    $('choice_' + choice_identity).remove();
    if (id) new Ajax.Request(url, { method : 'post' });
  }

};


Savvica.Widgets.Examples = {

  remove : function(example_id, id, url)
  {
    $('example_' + example_id).remove();
    if (id) new Ajax.Request(url, { method : 'post' });
  }

};


Savvica.Widgets.ResultMessages = {

  remove : function(message_identity, id, url)
  {
    $('result_message_' + message_identity).remove();
    if (id) new Ajax.Request(url, { method : 'post' });
  }

};


Savvica.Widgets.Rating = {

  binary : function(method, path, voter_control_id)
  {
    new Ajax.Request(path, { method : 'post' });
  }

};


Savvica.Widgets.OrganizationColumns = {

  lists: ['column_0', 'column_1', 'column_2'],

  updated: function (list) {
    // make sure all of the columns are as high as the tallest one
    Savvica.Widgets.OrganizationColumns.normalize_heights();
    // submit the changes
    var order = Sortable.serialize(list, { name : 'column_order', format : /(.*)/ });
    if (!order.match(/module/)) return;
    new Ajax.Request('/xhr/organization/order?column=' + list.id + '&' + order, {
      method : 'post'
    });
  },

  createSortables: function (event) {
    var lists = Savvica.Widgets.OrganizationColumns.lists;
    lists.each(function (id) {
      Sortable.create(id, {
        tag : 'div',
        only : 'block',
        dropOnEmpty : true,
        containment : lists,
        constraint : false,
        hoverblockclass : 'outline',
        onUpdate : Savvica.Widgets.OrganizationColumns.updated
      });
    });
    Savvica.Widgets.OrganizationColumns.normalize_heights();
  },

  normalize_heights : function() {
    var tallest = 0;
    Savvica.Widgets.OrganizationColumns.lists.each(function(list) {
      Element.writeAttribute($(list), { style : 'height:' });
      if ($(list).clientHeight > tallest) tallest = $(list).clientHeight;
    });
    Savvica.Widgets.OrganizationColumns.lists.each(function(list) {
      Element.writeAttribute($(list), { style : 'height:' + tallest + 'px' });
    });
  }

};


document.observe('dom:loaded', LearnHub.init);
// Dumb old crap that needs to be fixed: -- CKN
document.observe('dom:loaded', function() {
  Savvica.Forms.AccountNotifications.evaluateState();
  Savvica.Forms.FoldableFieldsets.init();
  Savvica.Forms.Licensing.init();
  Savvica.Forms.Publishing.init();
  Savvica.Forms.Compass.init();
  Savvica.Forms.Publishing.init();
});


// Prototype port of Farbtastic 1.2
Element.addMethods({
  protofarbtastic: function(container, callback) {
    var container = $(container);
    return container._protofarbtastic || (container._protofarbtastic = new ProtoFarbtastic(container, callback));
  }
});

var ProtoFarbtastic = Class.create();

ProtoFarbtastic.prototype = {

  initialize: function (container, callback) {
    // Store farbtastic object
    var fb = this;
    // Insert markup
    $(container).innerHTML = '<div class="farbtastic"><div class="color"></div><div class="wheel"></div><div class="overlay"></div><div class="h-marker marker"></div><div class="sl-marker marker"></div></div>';
    var e = $A(container.select('.farbtastic'));
    fb.wheel = container.select('.wheel')[0];
    // Dimensions
    fb.radius = 84;
    fb.square = 100;
    fb.width = 194;
    // Fix background PNGs in IE6
    if (navigator.appVersion.match(/MSIE [0-6]\./)) {
      e.each(function (el) {
        if (el.style.backgroundImage != 'none') {
          var image = el.style.backgroundImage;
          image = el.style.backgroundImage.substring(5, image.length - 2);
          $(el).setStyle({
            backgroundImage: 'none',
            filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
          });
        }
      });
    }

    //Link to the given element(s) or callback.
    fb.linkTo = function (callback) {
      // Unbind previous nodes
      if (typeof fb.callback == 'object') Event.stopObserving(fb, 'keyup', fb.updateValue, false);
      // Reset color
      fb.color = null;
      // Bind callback or elements
      if (typeof callback == 'function') {
        fb.callback = callback;
      } else if (typeof callback == 'object' || typeof callback == 'string') {
        fb.callback = $(callback);
        Event.observe(fb.callback, 'keyup', fb.updateValue, false);
        if (fb.callback.value) fb.setColor(fb.callback.value);
      }
      return this;
    }

    fb.updateValue = function (event) {
      if (this.value && this.value != fb.color) {
        // Force upper-case hex values...
        this.value = this.value.toUpperCase();
        if (this.value.indexOf('#') != 0) this.value = '#' + this.value;
        fb.setColor(this.value);
      }
      Event.stop(event);
    }

    // Change color with HTML syntax #123456
    fb.setColor = function (color) {
      var unpack = fb.unpack(color);
      if (fb.color != color && unpack) {
        fb.color = color;
        fb.rgb = unpack;
        fb.hsl = fb.RGBToHSL(fb.rgb);
        fb.updateDisplay();
      }
      return this;
    }

    // Change color with HSL triplet [0..1, 0..1, 0..1]
    fb.setHSL = function (hsl) {
      fb.hsl = hsl;
      fb.rgb = fb.HSLToRGB(hsl);
      fb.color = fb.pack(fb.rgb);
      fb.updateDisplay();
      return this;
    }

    /////////////////////////////////////////////////////
    // Retrieve the coordinates of the given event relative to the center
    // of the widget.
    fb.widgetCoords = function (event) {
      var x, y;
      var el = event.target || event.srcElement;
      var reference = fb.wheel;
      if (typeof event.offsetX != 'undefined') {
        // Use offset coordinates and find common offsetParent
        var pos = { x: event.offsetX, y: event.offsetY };
        // Send the coordinates upwards through the offsetParent chain.
        var e = el;
        while (e) {
          e.mouseX = pos.x;
          e.mouseY = pos.y;
          pos.x += e.offsetLeft;
          pos.y += e.offsetTop;
          e = e.offsetParent;
        }
        // Look for the coordinates starting from the wheel widget.
        var e = reference;
        var offset = { x: 0, y: 0 }
        while (e) {
          if (typeof e.mouseX != 'undefined') {
            x = e.mouseX - offset.x;
            y = e.mouseY - offset.y;
            break;
          }
          offset.x += e.offsetLeft;
          offset.y += e.offsetTop;
          e = e.offsetParent;
        }
        // Reset stored coordinates
        e = el;
        while (e) {
          e.mouseX = undefined;
          e.mouseY = undefined;
          e = e.offsetParent;
        }
      }
      else {
        // Use absolute coordinates
        var pos = fb.absolutePosition(reference);
        x = (event.pageX || 0*(event.clientX + document.body.scrollLeft)) - pos.x;
        y = (event.pageY || 0*(event.clientY + document.body.scrollTop)) - pos.y;
      }
      Event.stop(event);
      // Subtract distance to middle
      return { x: x - fb.width / 2, y: y - fb.width / 2 };
    }

    // Mousedown handler
    fb.mousedown = function (event) {
      // Capture mouse
      if (!document.dragging) {
        Event.observe(document, 'mousemove', fb.mousemove, false);
        Event.observe(document, 'mouseup',   fb.mouseup, false);
        document.dragging = true;
      }
      // Check which area is being dragged
      var pos = fb.widgetCoords(event);
      fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
      // Process
      fb.mousemove(event);
      if (event) Event.stop(event);
      return false;
    }

    // Mousemove handler
    fb.mousemove = function (event) {
      // Get coordinates relative to color picker center
      var pos = fb.widgetCoords(event);
      // Set new HSL parameters
      if (fb.circleDrag) {
        var hue = Math.atan2(pos.x, -pos.y) / 6.28;
        if (hue < 0) hue += 1;
        fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
      }
      else {
        var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
        var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
        fb.setHSL([fb.hsl[0], sat, lum]);
      }
      Event.stop(event);
      return false;
    }

    // Mouseup handler
    fb.mouseup = function () {
      // Uncapture mouse
      Event.stopObserving(document, 'mousemove', fb.mousemove, false);
      Event.stopObserving(document, 'mouseup',   fb.mouseup, false);
      document.dragging = false;
    }

    // Update the markers and styles
    fb.updateDisplay = function () {
      // Markers
      var angle = fb.hsl[0] * 6.28;
      $A(e).each(function(itE) {
        $A(itE.select('.h-marker')).each(function(el) {
          el.setStyle({
            left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
            top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
          });
        });
      });
      $A(e).each(function(itE) {
        $A(itE.select('.sl-marker')).each(function(el) {
          el.setStyle({
            left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
            top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
          });
        });
      });
      // Saturation/Luminance gradient
      $A(e).each(function(itE) {
        $A(itE.select('.color')).each(function(el) {
          el.setStyle({
            backgroundColor: fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5]))
          });
        });
      });
      // Linked elements or callback
      if (typeof fb.callback == 'object') {
        // Set background/foreground color
        $A([fb.callback]).flatten().each(function(el) {
          el.setStyle({
            backgroundColor: fb.color,
            color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
          });
        });
        // Change linked value
        $A([fb.callback]).flatten().each(function(el) {
          if (el.value && el.value != fb.color) {
            el.value = fb.color;
          }
        });
      } else if (typeof fb.callback == 'function') {
        fb.callback.call(fb, fb.color);
      }
    }

    // Get absolute position of element
    fb.absolutePosition = function (el) {
      var r = { x: el.offsetLeft, y: el.offsetTop };
      // Resolve relative to offsetParent
      if (el.offsetParent) {
        var tmp = fb.absolutePosition(el.offsetParent);
        r.x += tmp.x;
        r.y += tmp.y;
      }
      return r;
    };

    // Various color utility functions
    fb.pack = function (rgb) {
      var r = Math.round(rgb[0] * 255);
      var g = Math.round(rgb[1] * 255);
      var b = Math.round(rgb[2] * 255);
      return ('#' + (r < 16 ? '0' : '') + r.toString(16) +
                    (g < 16 ? '0' : '') + g.toString(16) +
                    (b < 16 ? '0' : '') + b.toString(16)).toUpperCase();
    }

    fb.unpack = function (color) {
      if (color.length == 7) {
        return [parseInt('0x' + color.substring(1, 3)) / 255,
                parseInt('0x' + color.substring(3, 5)) / 255,
                parseInt('0x' + color.substring(5, 7)) / 255];
      }
      else if (color.length == 4) {
        return [parseInt('0x' + color.substring(1, 2)) / 15,
                parseInt('0x' + color.substring(2, 3)) / 15,
                parseInt('0x' + color.substring(3, 4)) / 15];
      }
    }

    fb.HSLToRGB = function (hsl) {
      var m1, m2, r, g, b;
      var h = hsl[0], s = hsl[1], l = hsl[2];
      m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
      m1 = l * 2 - m2;
      return [this.hueToRGB(m1, m2, h+0.33333),
              this.hueToRGB(m1, m2, h),
              this.hueToRGB(m1, m2, h-0.33333)];
    }

    fb.hueToRGB = function (m1, m2, h) {
      h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
      if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
      if (h * 2 < 1) return m2;
      if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
      return m1;
    }

    fb.RGBToHSL = function (rgb) {
      var min, max, delta, h, s, l;
      var r = rgb[0], g = rgb[1], b = rgb[2];
      min = Math.min(r, Math.min(g, b));
      max = Math.max(r, Math.max(g, b));
      delta = max - min;
      l = (min + max) / 2;
      s = 0;
      if (l > 0 && l < 1) {
        s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
      }
      h = 0;
      if (delta > 0) {
        if (max == r && max != g) h += (g - b) / delta;
        if (max == g && max != b) h += (2 + (b - r) / delta);
        if (max == b && max != r) h += (4 + (r - g) / delta);
        h /= 6;
      }
      return [h, s, l];
    }

    // Install mousedown handler (the others are set on the document on-demand)
    // $('*', e).mousedown(fb.mousedown);
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/* 
 * flowplayer.js 3.1.2. The Flowplayer API
 * 
 * Copyright 2009 Flowplayer Oy
 * 
 * This file is part of Flowplayer.
 * 
 * Flowplayer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Flowplayer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Flowplayer.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Date: 2009-02-25 16:24:29 -0500 (Wed, 25 Feb 2009)
 * Revision: 166 
 */
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