(function(){window.ensure=function(data,callback,scope)
{if(typeof jQuery=="undefined"&&typeof Sys=="undefined"&&typeof Prototype=="undefined")
return alert("jQuery, Microsoft ASP.NET AJAX or Prototype library not found. One must be present for ensure to work");if(typeof data.test!="undefined")
{var test=function(){return data.test};if(typeof data.test=="string")
{test=function()
{return!(eval("typeof "+data.test)=="undefined"
&&document.getElementById(data.test)==null);}}
else if(typeof data.test=="function")
{test=data.test;}
if(test()===false||typeof test()=="undefined"||test()==null)
new ensureExecutor(data,callback,scope);else
callback();}
else
{new ensureExecutor(data,callback,scope);}}
window.ensureExecutor=function(data,callback,scope)
{this.data=this.clone(data);this.callback=(typeof scope=="undefined"||null==scope?callback:this.delegate(callback,scope));this.loadStack=[];if(data.js&&data.js.constructor!=Array)this.data.js=[data.js];if(data.html&&data.html.constructor!=Array)this.data.html=[data.html];if(data.css&&data.css.constructor!=Array)this.data.css=[data.css];if(typeof data.js=="undefined")this.data.js=[];if(typeof data.html=="undefined")this.data.html=[];if(typeof data.css=="undefined")this.data.css=[];this.init();this.load();}
window.ensureExecutor.prototype={init:function()
{if(typeof jQuery!="undefined")
{this.getJS=HttpLibrary.loadJavascript_jQuery;this.httpGet=HttpLibrary.httpGet_jQuery;}
else if(typeof Prototype!="undefined")
{this.getJS=HttpLibrary.loadJavascript_Prototype;this.httpGet=HttpLibrary.httpGet_Prototype;}
else if(typeof Sys!="undefined")
{this.getJS=HttpLibrary.loadJavascript_MSAJAX;this.httpGet=HttpLibrary.httpGet_MSAJAX;}
else
{throw"jQuery, Prototype or MS AJAX framework not found";}},getJS:function(data)
{},httpGet:function(url,callback)
{},load:function()
{this.loadJavascripts(this.delegate(function(){this.loadCSS(this.delegate(function(){this.loadHtml(this.delegate(function(){this.callback()}))}))}));},loadJavascripts:function(complete)
{var scriptsToLoad=this.data.js.length;if(0===scriptsToLoad)return complete();this.forEach(this.data.js,function(href)
{if(HttpLibrary.isUrlLoaded(href)||this.isTagLoaded('script','src',href))
{scriptsToLoad--;}
else
{this.getJS({url:href,success:this.delegate(function(content)
{scriptsToLoad--;HttpLibrary.registerUrl(href);}),error:this.delegate(function(msg)
{scriptsToLoad--;if(typeof this.data.error=="function")this.data.error(href,msg);})});}});this.until({test:function(){return scriptsToLoad===0;},delay:50,callback:this.delegate(function()
{complete();})});},loadCSS:function(complete)
{if(0===this.data.css.length)return complete();var head=HttpLibrary.getHead();this.forEach(this.data.css,function(href)
{if(HttpLibrary.isUrlLoaded(href)||this.isTagLoaded('link','href',href))
{}
else
{var self=this;try
{(function(href,head)
{var link=document.createElement('link');link.setAttribute("href",href);link.setAttribute("rel","Stylesheet");link.setAttribute("type","text/css");head.appendChild(link);HttpLibrary.registerUrl(href);}).apply(window,[href,head]);}
catch(e)
{if(typeof self.data.error=="function")self.data.error(href,e.message);}}});complete();},loadHtml:function(complete)
{var htmlToDownload=this.data.html.length;if(0===htmlToDownload)return complete();this.forEach(this.data.html,function(href)
{if(HttpLibrary.isUrlLoaded(href))
{htmlToDownload--;}
else
{this.httpGet({url:href,success:this.delegate(function(content)
{htmlToDownload--;HttpLibrary.registerUrl(href);var parent=(this.data.parent||document.body.appendChild(document.createElement("div")));if(typeof parent=="string")parent=document.getElementById(parent);parent.innerHTML=content;}),error:this.delegate(function(msg)
{htmlToDownload--;if(typeof this.data.error=="function")this.data.error(href,msg);})});}});this.until({test:function(){return htmlToDownload===0;},delay:50,callback:this.delegate(function()
{complete();})});},clone:function(obj)
{var cloned={};for(var p in obj)
{var x=obj[p];if(typeof x=="object")
{if(x.constructor==Array)
{var a=[];for(var i=0;i<x.length;i++)a.push(x[i]);cloned[p]=a;}
else
{cloned[p]=this.clone(x);}}
else
cloned[p]=x;}
return cloned;},forEach:function(arr,callback)
{var self=this;for(var i=0;i<arr.length;i++)
callback.apply(self,[arr[i]]);},delegate:function(func,obj)
{var context=obj||this;return function(){func.apply(context,arguments);}},until:function(o)
{if(o.test()===true)o.callback();else window.setTimeout(this.delegate(function(){this.until(o);}),o.delay||50);},isTagLoaded:function(tagName,attName,value)
{var tag=document.createElement(tagName);tag[attName]=value;var tagFound=false;var tags=document.getElementsByTagName(tagName);this.forEach(tags,function(t)
{if(tag[attName]===t[attName]){tagFound=true;return false}});return tagFound;}}
var userAgent=navigator.userAgent.toLowerCase();var HttpLibrary={browser:{version:(userAgent.match(/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/)||[])[1],safari:/webkit/.test(userAgent),opera:/opera/.test(userAgent),msie:/msie/.test(userAgent)&&!/opera/.test(userAgent),mozilla:/mozilla/.test(userAgent)&&!/(compatible|webkit)/.test(userAgent)},loadedUrls:{},isUrlLoaded:function(url)
{return HttpLibrary.loadedUrls[url]===true;},unregisterUrl:function(url)
{HttpLibrary.loadedUrls[url]=false;},registerUrl:function(url)
{HttpLibrary.loadedUrls[url]=true;},createScriptTag:function(url,success,error)
{var scriptTag=document.createElement("script");scriptTag.setAttribute("type","text/javascript");scriptTag.setAttribute("src",url);scriptTag.onload=scriptTag.onreadystatechange=function()
{if((!this.readyState||this.readyState=="loaded"||this.readyState=="complete")){success();}};scriptTag.onerror=function()
{error(data.url+" failed to load");};var head=HttpLibrary.getHead();head.appendChild(scriptTag);},getHead:function()
{return document.getElementsByTagName("head")[0]||document.documentElement},globalEval:function(data)
{var script=document.createElement("script");script.type="text/javascript";if(HttpLibrary.browser.msie)
script.text=data;else
script.appendChild(document.createTextNode(data));var head=HttpLibrary.getHead();head.appendChild(script);},loadJavascript_jQuery:function(data)
{if(HttpLibrary.browser.safari)
{return jQuery.ajax({type:"GET",url:data.url,data:null,success:function(content)
{HttpLibrary.globalEval(content);data.success();},error:function(xml,status,e)
{if(xml&&xml.responseText)
data.error(xml.responseText);else
data.error(url+'\n'+e.message);},dataType:"html"});}
else
{HttpLibrary.createScriptTag(data.url,data.success,data.error);}},loadJavascript_MSAJAX:function(data)
{if(HttpLibrary.browser.safari)
{var params={url:data.url,success:function(content)
{HttpLibrary.globalEval(content);data.success(content);},error:data.error};HttpLibrary.httpGet_MSAJAX(params);}
else
{HttpLibrary.createScriptTag(data.url,data.success,data.error);}},loadJavascript_Prototype:function(data)
{if(HttpLibrary.browser.safari)
{var params={url:data.url,success:function(content)
{HttpLibrary.globalEval(content);data.success(content);},error:data.error};HttpLibrary.httpGet_Prototype(params);}
else
{HttpLibrary.createScriptTag(data.url,data.success,data.error);}},httpGet_jQuery:function(data)
{return jQuery.ajax({type:"GET",url:data.url,data:null,success:data.success,error:function(xml,status,e)
{if(xml&&xml.responseText)
data.error(xml.responseText);else
data.error("Error occured while loading: "+url+'\n'+e.message);},dataType:data.type||"html"});},httpGet_MSAJAX:function(data)
{var _wRequest=new Sys.Net.WebRequest();_wRequest.set_url(data.url);_wRequest.set_httpVerb("GET");_wRequest.add_completed(function(result)
{var errorMsg="Failed to load:"+data.url;if(result.get_timedOut()){errorMsg="Timed out";}
if(result.get_aborted()){errorMsg="Aborted";}
if(result.get_responseAvailable())data.success(result.get_responseData());else data.error(errorMsg);});var executor=new Sys.Net.XMLHttpExecutor();_wRequest.set_executor(executor);executor.executeRequest();},httpGet_Prototype:function(data)
{new Ajax.Request(data.url,{method:'get',evalJS:false,onSuccess:function(transport,json)
{data.success(transport.responseText||"");},onFailure:data.error});}};})();