var Prototype = {
 Version: '1.6.1',

 Browser: (function(){
 var ua = navigator.userAgent;
 var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
 return {
  IE:    !!window.attachEvent && !isOpera,
  Opera:   isOpera,
  WebKit:   ua.indexOf('AppleWebKit/') > -1,
  Gecko:   ua.indexOf('Gecko') > -1 && ua.indexOf('KHTML') === -1,
  MobileSafari: /Apple.*Mobile.*Safari/.test(ua)
 }
 })(),

 BrowserFeatures: {
 XPath: !!document.evaluate,
 SelectorsAPI: !!document.querySelector,
 ElementExtensions: (function() {
  var constructor = window.Element || window.HTMLElement;
  return !!(constructor && constructor.prototype);
 })(),
 SpecificElementExtensions: (function() {
  if (typeof window.HTMLDivElement !== 'undefined')
  return true;

  var div = document.createElement('div');
  var form = document.createElement('form');
  var isSupported = false;

  if (div['__proto__'] && (div['__proto__'] !== form['__proto__'])) {
  isSupported = true;
  }

  div = form = null;

  return isSupported;
 })()
 },

 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;


var Abstract = { };


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;
 }
};

/* Based on Alex Arnell's inheritance implementation. */

var Class = (function() {
 function subclass() {};
 function create() {
 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) {
  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;
 }

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

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

 return {
 create: create,
 Methods: {
  addMethods: addMethods
 }
 };
})();
(function() {

 var _toString = Object.prototype.toString;

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

 function inspect(object) {
 try {
  if (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;
 }
 }

 function toJSON(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 (isElement(object)) return;

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

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

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

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

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

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

 function clone(object) {
 return extend({ }, object);
 }

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

 function isArray(object) {
 return _toString.call(object) == "[object Array]";
 }


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

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

 function isString(object) {
 return _toString.call(object) == "[object String]";
 }

 function isNumber(object) {
 return _toString.call(object) == "[object Number]";
 }

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

 extend(Object, {
 extend:  extend,
 inspect:  inspect,
 toJSON:  toJSON,
 toQueryString: toQueryString,
 toHTML:  toHTML,
 keys:   keys,
 values:  values,
 clone:   clone,
 isElement:  isElement,
 isArray:  isArray,
 isHash:  isHash,
 isFunction: isFunction,
 isString:  isString,
 isNumber:  isNumber,
 isUndefined: isUndefined
 });
})();
Object.extend(Function.prototype, (function() {
 var slice = Array.prototype.slice;

 function update(array, args) {
 var arrayLength = array.length, length = args.length;
 while (length--) array[arrayLength + length] = args[length];
 return array;
 }

 function merge(array, args) {
 array = slice.call(array, 0);
 return update(array, args);
 }

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

 function bind(context) {
 if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
 var __method = this, args = slice.call(arguments, 1);
 return function() {
  var a = merge(args, arguments);
  return __method.apply(context, a);
 }
 }

 function bindAsEventListener(context) {
 var __method = this, args = slice.call(arguments, 1);
 return function(event) {
  var a = update([event || window.event], args);
  return __method.apply(context, a);
 }
 }

 function curry() {
 if (!arguments.length) return this;
 var __method = this, args = slice.call(arguments, 0);
 return function() {
  var a = merge(args, arguments);
  return __method.apply(this, a);
 }
 }

 function delay(timeout) {
 var __method = this, args = slice.call(arguments, 1);
 timeout = timeout * 1000
 return window.setTimeout(function() {
  return __method.apply(__method, args);
 }, timeout);
 }

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

 function wrap(wrapper) {
 var __method = this;
 return function() {
  var a = update([__method.bind(this)], arguments);
  return wrapper.apply(this, a);
 }
 }

 function methodize() {
 if (this._methodized) return this._methodized;
 var __method = this;
 return this._methodized = function() {
  var a = update([this], arguments);
  return __method.apply(null, a);
 };
 }

 return {
 argumentNames:  argumentNames,
 bind:    bind,
 bindAsEventListener: bindAsEventListener,
 curry:    curry,
 delay:    delay,
 defer:    defer,
 wrap:    wrap,
 methodize:   methodize
 }
})());


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"';
};


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();
  this.currentlyExecuting = false;
  } catch(e) {
  this.currentlyExecuting = false;
  throw e;
  }
 }
 }
});
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, (function() {

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

 function gsub(pattern, replacement) {
 var result = '', source = this, match;
 replacement = prepareReplacement(replacement);

 if (Object.isString(pattern))
  pattern = RegExp.escape(pattern);

 if (!(pattern.length || pattern.source)) {
  replacement = replacement('');
  return replacement + source.split('').join(replacement) + 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;
 }

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

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

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

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

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

 function stripTags() {
 return this.replace(/<\w+(\s+("[^"]*"|'[^']*'|[^>])+)?>|<\/\w+>/gi, '');
 }

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

 function extractScripts() {
 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];
 });
 }

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

 function escapeHTML() {
 return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
 }

 function unescapeHTML() {
 return this.stripTags().replace(/&lt;/g,'<').replace(/&gt;/g,'>').replace(/&amp;/g,'&');
 }


 function toQueryParams(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;
 });
 }

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

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

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

 function camelize() {
 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;
 }

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

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

 function dasherize() {
 return this.replace(/_/g, '-');
 }

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

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

 function unfilterJSON(filter) {
 return this.replace(filter || Prototype.JSONFilter, '$1');
 }

 function isJSON() {
 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);
 }

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

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

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

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

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

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

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

 return {
 gsub:   gsub,
 sub:   sub,
 scan:   scan,
 truncate:  truncate,
 strip:   String.prototype.trim ? String.prototype.trim : strip,
 stripTags:  stripTags,
 stripScripts: stripScripts,
 extractScripts: extractScripts,
 evalScripts: evalScripts,
 escapeHTML:  escapeHTML,
 unescapeHTML: unescapeHTML,
 toQueryParams: toQueryParams,
 parseQuery:  toQueryParams,
 toArray:  toArray,
 succ:   succ,
 times:   times,
 camelize:  camelize,
 capitalize:  capitalize,
 underscore:  underscore,
 dasherize:  dasherize,
 inspect:  inspect,
 toJSON:   toJSON,
 unfilterJSON: unfilterJSON,
 isJSON:   isJSON,
 evalJSON:  evalJSON,
 include:  include,
 startsWith:  startsWith,
 endsWith:  endsWith,
 empty:   empty,
 blank:   blank,
 interpolate: interpolate
 };
})());

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

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

 return this.template.gsub(this.pattern, function(match) {
  if (object == null) return (match[1] + '');

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

 function eachSlice(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);
 }

 function all(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;
 }

 function any(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;
 }

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

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

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

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

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

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

 function include(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;
 }

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

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

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

 function max(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;
 }

 function min(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;
 }

 function partition(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];
 }

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

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

 function sortBy(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');
 }

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

 function zip() {
 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));
 });
 }

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

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









 return {
 each:  each,
 eachSlice: eachSlice,
 all:  all,
 every:  all,
 any:  any,
 some:  any,
 collect: collect,
 map:  collect,
 detect:  detect,
 findAll: findAll,
 select:  findAll,
 filter:  findAll,
 grep:  grep,
 include: include,
 member:  include,
 inGroupsOf: inGroupsOf,
 inject:  inject,
 invoke:  invoke,
 max:  max,
 min:  min,
 partition: partition,
 pluck:  pluck,
 reject:  reject,
 sortBy:  sortBy,
 toArray: toArray,
 entries: toArray,
 zip:  zip,
 size:  size,
 inspect: inspect,
 find:  detect
 };
})();
function $A(iterable) {
 if (!iterable) return [];
 if ('toArray' in Object(iterable)) return iterable.toArray();
 var length = iterable.length || 0, results = new Array(length);
 while (length--) results[length] = iterable[length];
 return results;
}

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

Array.from = $A;


(function() {
 var arrayProto = Array.prototype,
  slice = arrayProto.slice,
  _each = arrayProto.forEach; // use native browser JS 1.6 implementation if available

 function each(iterator) {
 for (var i = 0, length = this.length; i < length; i++)
  iterator(this[i]);
 }
 if (!_each) _each = each;

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

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

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

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

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

 function without() {
 var values = slice.call(arguments, 0);
 return this.select(function(value) {
  return !values.include(value);
 });
 }

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

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

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


 function clone() {
 return slice.call(this, 0);
 }

 function size() {
 return this.length;
 }

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

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

 function indexOf(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;
 }

 function lastIndexOf(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;
 }

 function concat() {
 var array = slice.call(this, 0), item;
 for (var i = 0, length = arguments.length; i < length; i++) {
  item = arguments[i];
  if (Object.isArray(item) && !('callee' in item)) {
  for (var j = 0, arrayLength = item.length; j < arrayLength; j++)
   array.push(item[j]);
  } else {
  array.push(item);
  }
 }
 return array;
 }

 Object.extend(arrayProto, Enumerable);

 if (!arrayProto._reverse)
 arrayProto._reverse = arrayProto.reverse;

 Object.extend(arrayProto, {
 _each:  _each,
 clear:  clear,
 first:  first,
 last:  last,
 compact: compact,
 flatten: flatten,
 without: without,
 reverse: reverse,
 uniq:  uniq,
 intersect: intersect,
 clone:  clone,
 toArray: clone,
 size:  size,
 inspect: inspect,
 toJSON: toJSON
 });

 var CONCAT_ARGUMENTS_BUGGY = (function() {
 return [].concat(arguments)[0][0] !== 1;
 })(1,2)

 if (CONCAT_ARGUMENTS_BUGGY) arrayProto.concat = concat;

 if (!arrayProto.indexOf) arrayProto.indexOf = indexOf;
 if (!arrayProto.lastIndexOf) arrayProto.lastIndexOf = lastIndexOf;
})();
function $H(object) {
 return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {
 function initialize(object) {
 this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
 }

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

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

 function get(key) {
 if (this._object[key] !== Object.prototype[key])
  return this._object[key];
 }

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

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

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

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

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

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

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

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

 function toQueryString() {
 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('&');
 }

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

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

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

 return {
 initialize:    initialize,
 _each:     _each,
 set:     set,
 get:     get,
 unset:     unset,
 toObject:    toObject,
 toTemplateReplacements: toObject,
 keys:     keys,
 values:     values,
 index:     index,
 merge:     merge,
 update:     update,
 toQueryString:   toQueryString,
 inspect:    inspect,
 toJSON:     toJSON,
 clone:     clone
 };
})());

Hash.from = $H;
Object.extend(Number.prototype, (function() {
 function toColorPart() {
 return this.toPaddedString(2, 16);
 }

 function succ() {
 return this + 1;
 }

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

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

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

 function abs() {
 return Math.abs(this);
 }

 function round() {
 return Math.round(this);
 }

 function ceil() {
 return Math.ceil(this);
 }

 function floor() {
 return Math.floor(this);
 }

 return {
 toColorPart: toColorPart,
 succ:   succ,
 times:   times,
 toPaddedString: toPaddedString,
 toJSON:   toJSON,
 abs:   abs,
 round:   round,
 ceil:   ceil,
 floor:   floor
 };
})());

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

var ObjectRange = Class.create(Enumerable, (function() {
 function initialize(start, end, exclusive) {
 this.start = start;
 this.end = end;
 this.exclusive = exclusive;
 }

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

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

 return {
 initialize: initialize,
 _each:  _each,
 include: include
 };
})());



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)) {
  params['_method'] = this.method;
  this.method = 'post';
 }

 this.parameters = params;

 if (params = Object.toQueryString(params)) {
  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';
 }

 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') {
  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) {
 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(global) {

 var SETATTRIBUTE_IGNORES_NAME = (function(){
 var elForm = document.createElement("form");
 var elInput = document.createElement("input");
 var root = document.documentElement;
 elInput.setAttribute("name", "test");
 elForm.appendChild(elInput);
 root.appendChild(elForm);
 var isBuggy = elForm.elements
  ? (typeof elForm.elements.test == "undefined")
  : null;
 root.removeChild(elForm);
 elForm = elInput = null;
 return isBuggy;
 })();

 var element = global.Element;
 global.Element = function(tagName, attributes) {
 attributes = attributes || { };
 tagName = tagName.toLowerCase();
 var cache = Element.cache;
 if (SETATTRIBUTE_IGNORES_NAME && 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(global.Element, element || { });
 if (element) global.Element.prototype = element.prototype;
})(this);

Element.cache = { };
Element.idCounter = 1;

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(){

 var SELECT_ELEMENT_INNERHTML_BUGGY = (function(){
  var el = document.createElement("select"),
   isBuggy = true;
  el.innerHTML = "<option value=\"test\">test</option>";
  if (el.options && el.options[0]) {
  isBuggy = el.options[0].nodeName.toUpperCase() !== "OPTION";
  }
  el = null;
  return isBuggy;
 })();

 var TABLE_ELEMENT_INNERHTML_BUGGY = (function(){
  try {
  var el = document.createElement("table");
  if (el && el.tBodies) {
   el.innerHTML = "<tbody><tr><td>test</td></tr></tbody>";
   var isBuggy = typeof el.tBodies[0] == "undefined";
   el = null;
   return isBuggy;
  }
  } catch (e) {
  return true;
  }
 })();

 var SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING = (function () {
  var s = document.createElement("script"),
   isBuggy = false;
  try {
  s.appendChild(document.createTextNode(""));
  isBuggy = !s.firstChild ||
   s.firstChild && s.firstChild.nodeType !== 3;
  } catch (e) {
  isBuggy = true;
  }
  s = null;
  return isBuggy;
 })();

 function update(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 === 'SCRIPT' && SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING) {
  element.text = content;
  return element;
  }

  if (SELECT_ELEMENT_INNERHTML_BUGGY || TABLE_ELEMENT_INNERHTML_BUGGY) {
  if (tagName in Element._insertionTranslations.tags) {
   while (element.firstChild) {
   element.removeChild(element.firstChild);
   }
   Element._getContentFromAnonymousElement(tagName, content.stripScripts())
   .each(function(node) {
    element.appendChild(node)
   });
  }
  else {
   element.innerHTML = content.stripScripts();
  }
  }
  else {
  element.innerHTML = content.stripScripts();
  }

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

 return update;
 })(),

 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(element, 'parentNode');
 },

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

 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(element, 'previousSibling');
 },

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

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

 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(element);
 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(element);
 return Object.isNumber(expression) ? Element.descendants(element)[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(element);
 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(element);
 return Object.isNumber(expression) ? nextSiblings[expression] :
  Selector.findElement(nextSiblings, expression, index);
 },


 select: function(element) {
 var args = Array.prototype.slice.call(arguments, 1);
 return Selector.findChildElements(element, args);
 },

 adjacent: function(element) {
 var args = Array.prototype.slice.call(arguments, 1);
 return Selector.findChildElements(element.parentNode, args).without(element);
 },

 identify: function(element) {
 element = $(element);
 var id = Element.readAttribute(element, 'id');
 if (id) return id;
 do { id = 'anonymous_element_' + Element.idCounter++ } while ($(id));
 Element.writeAttribute(element, '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(element).height;
 },

 getWidth: function(element) {
 return Element.getDimensions(element).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(element, 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(element, className) ?
  'removeClassName' : 'addClassName'](element, className);
 },

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

 var els = element.style;
 var originalVisibility = els.visibility;
 var originalPosition = els.position;
 var originalDisplay = els.display;
 els.visibility = 'hidden';
 if (originalPosition != 'fixed') // Switching fixed to absolute causes issues in Safari
  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';
  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(element, 'position') == 'absolute') return element;

 var offsets = Element.positionedOffset(element);
 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(element, 'position') == 'relative') return element;

 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;

  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] || { });

 source = $(source);
 var p = Element.viewportOffset(source);

 element = $(element);
 var delta = [0, 0];
 var parent = null;
 if (Element.getStyle(element, 'position') == 'absolute') {
  parent = Element.getOffsetParent(element);
  delta = Element.viewportOffset(parent);
 }

 if (parent == document.body) {
  delta[0] -= document.body.offsetLeft;
  delta[1] -= document.body.offsetTop;
 }

 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;
 }
};

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':
   if (!Element.visible(element)) return null;

   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) {
 Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
 function(proceed, element) {
  element = $(element);
  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);
  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 = (function(){

 var classProp = 'className';
 var forProp = 'for';

 var el = document.createElement('div');

 el.setAttribute(classProp, 'x');

 if (el.className !== 'x') {
  el.setAttribute('class', 'x');
  if (el.className === 'x') {
  classProp = 'class';
  }
 }
 el = null;

 el = document.createElement('label');
 el.setAttribute(forProp, 'x');
 if (el.htmlFor !== 'x') {
  el.setAttribute('htmlFor', 'x');
  if (el.htmlFor === 'x') {
  forProp = 'htmlFor';
  }
 }
 el = null;

 return {
  read: {
  names: {
   'class':  classProp,
   'className': classProp,
   'for':  forProp,
   'htmlFor': forProp
  },
  values: {
   _getAttr: function(element, attribute) {
   return element.getAttribute(attribute);
   },
   _getAttr2: function(element, attribute) {
   return element.getAttribute(attribute, 2);
   },
   _getAttrNode: function(element, attribute) {
   var node = element.getAttributeNode(attribute);
   return node ? node.value : "";
   },
   _getEv: (function(){

   var el = document.createElement('div');
   el.onclick = Prototype.emptyFunction;
   var value = el.getAttribute('onclick');
   var f;

   if (String(value).indexOf('{') > -1) {
    f = function(element, attribute) {
    attribute = element.getAttribute(attribute);
    if (!attribute) return null;
    attribute = attribute.toString();
    attribute = attribute.split('{')[1];
    attribute = attribute.split('}')[0];
    return attribute.strip();
    };
   }
   else if (value === '') {
    f = function(element, attribute) {
    attribute = element.getAttribute(attribute);
    if (!attribute) return null;
    return attribute.strip();
    };
   }
   el = null;
   return f;
   })(),
   _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._getAttr2,
  src:   v._getAttr2,
  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);

 if (Prototype.BrowserFeatures.ElementExtensions) {
 (function() {
  function _descendants(element) {
  var nodes = element.getElementsByTagName('*'), results = [];
  for (var i = 0, node; node = nodes[i]; i++)
   if (node.tagName !== "!") // Filter out comment nodes.
   results.push(node);
  return results;
  }

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

}

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;
 };

 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 ('outerHTML' in document.documentElement) {
 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() {
 var tags = Element._insertionTranslations.tags;
 Object.extend(tags, {
 THEAD: tags.TBODY,
 TFOOT: tags.TBODY,
 TH: tags.TD
 });
})();

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);

(function(div) {

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

 div = null;

})(document.createElement('div'))

Element.extend = (function() {

 function checkDeficiency(tagName) {
 if (typeof window.Element != 'undefined') {
  var proto = window.Element.prototype;
  if (proto) {
  var id = '_' + (Math.random()+'').slice(2);
  var el = document.createElement(tagName);
  proto[id] = 'x';
  var isBuggy = (el[id] !== 'x');
  delete proto[id];
  el = null;
  return isBuggy;
  }
 }
 return false;
 }

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

 var HTMLOBJECTELEMENT_PROTOTYPE_BUGGY = checkDeficiency('object');

 if (Prototype.BrowserFeatures.SpecificElementExtensions) {
 if (HTMLOBJECTELEMENT_PROTOTYPE_BUGGY) {
  return function(element) {
  if (element && typeof element._extendedByPrototype == 'undefined') {
   var t = element.tagName;
   if (t && (/^(?:object|applet|embed)$/i.test(t))) {
   extendElementWith(element, Element.Methods);
   extendElementWith(element, Element.Methods.Simulated);
   extendElementWith(element, Element.Methods.ByTag[t.toUpperCase()]);
   }
  }
  return element;
  }
 }
 return Prototype.K;
 }

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

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

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

 if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

 extendElementWith(element, methods);

 element._extendedByPrototype = Prototype.emptyFunction;
 return element;

 }, {
 refresh: function() {
  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];

 var element = document.createElement(tagName);
 var proto = element['__proto__'] || element.constructor.prototype;
 element = null;
 return proto;
 }

 var elementPrototype = window.HTMLElement ? HTMLElement.prototype :
 Element.prototype;

 if (F.ElementExtensions) {
 copy(Element.Methods, elementPrototype);
 copy(Element.Methods.Simulated, elementPrototype, 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() {
 return { width: this.getWidth(), height: this.getHeight() };
 },

 getScrollOffsets: function() {
 return Element._returnOffset(
  window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
  window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
 }
};

(function(viewport) {
 var B = Prototype.Browser, doc = document, element, property = {};

 function getRootElement() {
 if (B.WebKit && !doc.evaluate)
  return document;

 if (B.Opera && window.parseFloat(window.opera.version()) < 9.5)
  return document.body;

 return document.documentElement;
 }

 function define(D) {
 if (!element) element = getRootElement();

 property[D] = 'client' + D;

 viewport['get' + D] = function() { return element[property[D]] };
 return viewport['get' + D]();
 }

 viewport.getWidth = define.curry('Width');

 viewport.getHeight = define.curry('Height');
})(document.viewport);


Element.Storage = {
 UID: 1
};

Element.addMethods({
 getStorage: function(element) {
 if (!(element = $(element))) return;

 var uid;
 if (element === window) {
  uid = 0;
 } else {
  if (typeof element._prototypeUID === "undefined")
  element._prototypeUID = [Element.Storage.UID++];
  uid = element._prototypeUID[0];
 }

 if (!Element.Storage[uid])
  Element.Storage[uid] = $H();

 return Element.Storage[uid];
 },

 store: function(element, key, value) {
 if (!(element = $(element))) return;

 if (arguments.length === 2) {
  Element.getStorage(element).update(key);
 } else {
  Element.getStorage(element).set(key, value);
 }

 return element;
 },

 retrieve: function(element, key, defaultValue) {
 if (!(element = $(element))) return;
 var hash = Element.getStorage(element), value = hash.get(key);

 if (Object.isUndefined(value)) {
  hash.set(key, defaultValue);
  value = defaultValue;
 }

 return value;
 },

 clone: function(element, deep) {
 if (!(element = $(element))) return;
 var clone = element.cloneNode(deep);
 clone._prototypeUID = void 0;
 if (deep) {
  var descendants = Element.select(clone, '*'),
   i = descendants.length;
  while (i--) {
  descendants[i]._prototypeUID = void 0;
  }
 }
 return Element.extend(clone);
 }
});
/* 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() {

 var IS_DESCENDANT_SELECTOR_BUGGY = (function(){
  var isBuggy = false;
  if (document.evaluate && window.XPathResult) {
  var el = document.createElement('div');
  el.innerHTML = '<ul><li></li></ul><div><ul><li></li></ul></div>';

  var xpath = ".//*[local-name()='ul' or local-name()='UL']" +
   "//*[local-name()='li' or local-name()='LI']";

  var result = document.evaluate(xpath, el, null,
   XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);

  isBuggy = (result.snapshotLength !== 2);
  el = null;
  }
  return isBuggy;
 })();

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

  var e = this.expression;

  if (Prototype.Browser.WebKit &&
  (e.include("-of-type") || e.include(":empty")))
  return false;

  if ((/(\[[\w-]*?:|:checked)/).test(e))
  return false;

  if (IS_DESCENDANT_SELECTOR_BUGGY) return false;

  return true;
 }

 })(),

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

 if (Selector.CASE_INSENSITIVE_CLASS_NAMES) return false;

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

 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, len = ps.length, name;

 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 = 0; i<len; i++) {
  p = ps[i].re;
  name = ps[i].name;
  if (m = e.match(p)) {
   this.matcher.push(Object.isFunction(c[name]) ? c[name](m) :
   new Template(c[name]).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, len = ps.length, name;

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

 this.matcher = ['.//*'];
 while (e && le != e && (/\S/).test(e)) {
  le = e;
  for (var i = 0; i<len; i++) {
  name = ps[i].name;
  if (m = e.match(ps[i].re)) {
   this.matcher.push(Object.isFunction(x[name]) ? x[name](m) :
   new Template(x[name]).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':
  if (root !== document) {
   var oldId = root.id, id = $(root).identify();
   id = id.replace(/([\.:])/g, "\\$1");
   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, len = ps.length, name;

 while (e && le !== e && (/\S/).test(e)) {
  le = e;
  for (var i = 0; i<len; i++) {
  p = ps[i].re;
  name = ps[i].name;
  if (m = e.match(p)) {
   if (as[name]) {
   this.tokens.push([name, Object.clone(m)]);
   e = e.replace(m[0], '');
   } else {
   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() + ">";
 }
});

if (Prototype.BrowserFeatures.SelectorsAPI &&
 document.compatMode === 'BackCompat') {
 Selector.CASE_INSENSITIVE_CLASS_NAMES = (function(){
 var div = document.createElement('div'),
  span = document.createElement('span');

 div.id = "prototype_test_id";
 span.className = 'Test';
 div.appendChild(span);
 var isIgnored = (div.querySelector('#prototype_test_id .test') !== null);
 div = span = null;
 return isIgnored;
 })();
}

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, len = p.length, name;

  var exclusion = [];
  while (e && le != e && (/\S/).test(e)) {
   le = e;
   for (var i = 0; i<len; i++) {
   name = p[i].name
   if (m = e.match(p[i].re)) {
    v = Object.isFunction(x[name]) ? x[name](m) : new Template(x[name]).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: [
 { name: 'laterSibling', re: /^\s*~\s*/ },
 { name: 'child',  re: /^\s*>\s*/ },
 { name: 'adjacent',  re: /^\s*\+\s*/ },
 { name: 'descendant', re: /^\s/ },

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

 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: {
 concat: function(a, b) {
  for (var i = 0, node; node = b[i]; i++)
  a.push(node);
  return a;
 },

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

 unmark: (function(){

  var PROPERTIES_ATTRIBUTES_MAP = (function(){
  var el = document.createElement('div'),
   isBuggy = false,
   propName = '_countedByPrototype',
   value = 'x'
  el[propName] = value;
  isBuggy = (el.getAttribute(propName) === value);
  el = null;
  return isBuggy;
  })();

  return PROPERTIES_ATTRIBUTES_MAP ?
  function(nodes) {
   for (var i = 0, node; node = nodes[i]; i++)
   node.removeAttribute('_countedByPrototype');
   return nodes;
  } :
  function(nodes) {
   for (var i = 0, node; node = nodes[i]; i++)
   node._countedByPrototype = void 0;
   return nodes;
  }
 })(),

 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++;
  }
 },

 unique: function(nodes) {
  if (nodes.length == 0) return nodes;
  var results = [], n;
  for (var i = 0, l = nodes.length; i < l; i++)
  if (typeof (n = nodes[i])._countedByPrototype == 'undefined') {
   n._countedByPrototype = Prototype.emptyFunction;
   results.push(Element.extend(n));
  }
  return Selector.handlers.unmark(results);
 },

 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;
 },

 tagName: function(nodes, root, tagName, combinator) {
  var uTagName = tagName.toUpperCase();
  var results = [], h = Selector.handlers;
  if (nodes) {
  if (combinator) {
   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 (root == document) {
  if (!targetNode) return [];
  if (!nodes) return [targetNode];
  } else {
  if (!root.sourceIndex || root.sourceIndex < 1) {
   var nodes = root.getElementsByTagName('*');
   for (var j = 0, node; node = nodes[j]; j++) {
   if (node.id === id) return [node];
   }
  }
  }

  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);
 },

 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;
  });
 },

 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++) {
  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 + ' ').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, {
 concat: function(a, b) {
  for (var i = 0, node; node = b[i]; i++)
  if (node.tagName !== "!") a.push(node);
  return a;
 }
 });
}

function $$() {
 return Selector.findChildElements(document, $A(arguments));
}

var Form = {
 reset: function(form) {
 form = $(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) {
   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) {
 var elements = $(form).getElementsByTagName('*'),
  element,
  arr = [ ],
  serializers = Form.Element.Serializers;
 for (var i = 0; element = elements[i]; i++) {
  arr.push(element);
 }
 return arr.inject([], function(elements, child) {
  if (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)$/i.test(element.tagName);
 });
 },

 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 = $(element);
 try {
  element.focus();
  if (element.select && (element.tagName.toLowerCase() != 'input' ||
   !(/^(?:button|reset|submit)$/i.test(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) {
 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);
 }
});
(function() {

 var 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: {}
 };

 var docEl = document.documentElement;
 var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
 && 'onmouseleave' in docEl;

 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);
 };
 }

 function isLeftClick(event) { return _isButton(event, 0) }

 function isMiddleClick(event) { return _isButton(event, 1) }

 function isRightClick(event) { return _isButton(event, 2) }

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

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

 if (currentTarget && currentTarget.tagName) {
  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);
 }

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

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

 function pointerX(event) {
 var docElement = document.documentElement,
  body = document.body || { scrollLeft: 0 };

 return event.pageX || (event.clientX +
  (docElement.scrollLeft || body.scrollLeft) -
  (docElement.clientLeft || 0));
 }

 function pointerY(event) {
 var docElement = document.documentElement,
  body = document.body || { scrollTop: 0 };

 return event.pageY || (event.clientY +
  (docElement.scrollTop || body.scrollTop) -
  (docElement.clientTop || 0));
 }


 function stop(event) {
 Event.extend(event);
 event.preventDefault();
 event.stopPropagation();

 event.stopped = true;
 }

 Event.Methods = {
 isLeftClick: isLeftClick,
 isMiddleClick: isMiddleClick,
 isRightClick: isRightClick,

 element: element,
 findElement: findElement,

 pointer: pointer,
 pointerX: pointerX,
 pointerY: pointerY,

 stop: stop
 };


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

 if (Prototype.Browser.IE) {
 function _relatedTarget(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);
 }

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

 Event.extend = function(event, element) {
  if (!event) return false;
  if (event._extendedByPrototype) return event;

  event._extendedByPrototype = Prototype.emptyFunction;
  var pointer = Event.pointer(event);

  Object.extend(event, {
  target: event.srcElement || element,
  relatedTarget: _relatedTarget(event),
  pageX: pointer.x,
  pageY: pointer.y
  });

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

 function _createResponder(element, eventName, handler) {
 var registry = Element.retrieve(element, 'prototype_event_registry');

 if (Object.isUndefined(registry)) {
  CACHE.push(element);
  registry = Element.retrieve(element, 'prototype_event_registry', $H());
 }

 var respondersForEvent = registry.get(eventName);
 if (Object.isUndefined(respondersForEvent)) {
  respondersForEvent = [];
  registry.set(eventName, respondersForEvent);
 }

 if (respondersForEvent.pluck('handler').include(handler)) return false;

 var responder;
 if (eventName.include(":")) {
  responder = function(event) {
  if (Object.isUndefined(event.eventName))
   return false;

  if (event.eventName !== eventName)
   return false;

  Event.extend(event, element);
  handler.call(element, event);
  };
 } else {
  if (!MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED &&
  (eventName === "mouseenter" || eventName === "mouseleave")) {
  if (eventName === "mouseenter" || eventName === "mouseleave") {
   responder = function(event) {
   Event.extend(event, element);

   var parent = event.relatedTarget;
   while (parent && parent !== element) {
    try { parent = parent.parentNode; }
    catch(e) { parent = element; }
   }

   if (parent === element) return;

   handler.call(element, event);
   };
  }
  } else {
  responder = function(event) {
   Event.extend(event, element);
   handler.call(element, event);
  };
  }
 }

 responder.handler = handler;
 respondersForEvent.push(responder);
 return responder;
 }

 function _destroyCache() {
 for (var i = 0, length = CACHE.length; i < length; i++) {
  Event.stopObserving(CACHE[i]);
  CACHE[i] = null;
 }
 }

 var CACHE = [];

 if (Prototype.Browser.IE)
 window.attachEvent('onunload', _destroyCache);

 if (Prototype.Browser.WebKit)
 window.addEventListener('unload', Prototype.emptyFunction, false);


 var _getDOMEventName = Prototype.K;

 if (!MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED) {
 _getDOMEventName = function(eventName) {
  var translations = { mouseenter: "mouseover", mouseleave: "mouseout" };
  return eventName in translations ? translations[eventName] : eventName;
 };
 }

 function observe(element, eventName, handler) {
 element = $(element);

 var responder = _createResponder(element, eventName, handler);

 if (!responder) return element;

 if (eventName.include(':')) {
  if (element.addEventListener)
  element.addEventListener("dataavailable", responder, false);
  else {
  element.attachEvent("ondataavailable", responder);
  element.attachEvent("onfilterchange", responder);
  }
 } else {
  var actualEventName = _getDOMEventName(eventName);

  if (element.addEventListener)
  element.addEventListener(actualEventName, responder, false);
  else
  element.attachEvent("on" + actualEventName, responder);
 }

 return element;
 }

 function stopObserving(element, eventName, handler) {
 element = $(element);

 var registry = Element.retrieve(element, 'prototype_event_registry');

 if (Object.isUndefined(registry)) return element;

 if (eventName && !handler) {
  var responders = registry.get(eventName);

  if (Object.isUndefined(responders)) return element;

  responders.each( function(r) {
  Element.stopObserving(element, eventName, r.handler);
  });
  return element;
 } else if (!eventName) {
  registry.each( function(pair) {
  var eventName = pair.key, responders = pair.value;

  responders.each( function(r) {
   Element.stopObserving(element, eventName, r.handler);
  });
  });
  return element;
 }

 var responders = registry.get(eventName);

 if (!responders) return;

 var responder = responders.find( function(r) { return r.handler === handler; });
 if (!responder) return element;

 var actualEventName = _getDOMEventName(eventName);

 if (eventName.include(':')) {
  if (element.removeEventListener)
  element.removeEventListener("dataavailable", responder, false);
  else {
  element.detachEvent("ondataavailable", responder);
  element.detachEvent("onfilterchange", responder);
  }
 } else {
  if (element.removeEventListener)
  element.removeEventListener(actualEventName, responder, false);
  else
  element.detachEvent('on' + actualEventName, responder);
 }

 registry.set(eventName, responders.without(responder));

 return element;
 }

 function fire(element, eventName, memo, bubble) {
 element = $(element);

 if (Object.isUndefined(bubble))
  bubble = true;

 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 = bubble ? 'ondataavailable' : 'onfilterchange';
 }

 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);

 Object.extend(Event, {
 fire:   fire,
 observe:  observe,
 stopObserving: stopObserving
 });

 Element.addMethods({
 fire:   fire,

 observe:  observe,

 stopObserving: stopObserving
 });

 Object.extend(document, {
 fire:   fire.methodize(),

 observe:  observe.methodize(),

 stopObserving: stopObserving.methodize(),

 loaded:  false
 });

 if (window.Event) Object.extend(window.Event, Event);
 else window.Event = Event;
})();

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

 var timer;

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

 function checkReadyState() {
 if (document.readyState === 'complete') {
  document.stopObserving('readystatechange', checkReadyState);
  fireContentLoadedEvent();
 }
 }

 function pollDoScroll() {
 try { document.documentElement.doScroll('left'); }
 catch(e) {
  timer = pollDoScroll.defer();
  return;
 }
 fireContentLoadedEvent();
 }

 if (document.addEventListener) {
 document.addEventListener('DOMContentLoaded', fireContentLoadedEvent, false);
 } else {
 document.observe('readystatechange', checkReadyState);
 if (window == top)
  timer = pollDoScroll.defer();
 }

 Event.observe(window, 'load', fireContentLoadedEvent);
})();

Element.addMethods();

/*------------------------------- 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');

var Position = {
 includeScrollOffsets: false,

 prepare: function() {
 this.deltaX = window.pageXOffset
    || document.documentElement.scrollLeft
    || document.body.scrollLeft
    || 0;
 this.deltaY = window.pageYOffset
    || document.documentElement.scrollTop
    || document.body.scrollTop
    || 0;
 },

 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);
 },

 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;
 },


 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);

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