/* Prototype JavaScript framework, version 1.6.1
 * (c) 2005-2009 Sam Stephenson
 *
 * Prototype is freely distributable under the terms of an MIT-style license.
 * For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

var Prototype = {
 Version: '1.6.1',

 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);

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