/*
 * EnhanceJS version 1.1 - Test-Driven Progressive Enhancement
 * http://enhancejs.googlecode.com/
 * Copyright (c) 2010 Filament Group, Inc, authors.txt
 * Licensed under MIT (license.txt)
*/
(function(win,doc,undefined){var settings,body,fakeBody,windowLoaded,head,docElem=doc.documentElement,testPass=false,mediaCookieA,mediaCookieB,toggledMedia=[];if(doc.getElementsByTagName){head=doc.getElementsByTagName("head")[0]||docElem;}else{head=docElem;}win.enhance=function(options){options=options||{};settings={};for(var name in enhance.defaultSettings){var option=options[name];settings[name]=option!==undefined?option:enhance.defaultSettings[name];}for(var test in options.addTests){settings.tests[test]=options.addTests[test];}if(docElem.className.indexOf(settings.testName)===-1){docElem.className+=" "+settings.testName;}mediaCookieA=settings.testName+"-toggledmediaA";mediaCookieB=settings.testName+"-toggledmediaB";toggledMedia=[readCookie(mediaCookieA),readCookie(mediaCookieB)];setTimeout(function(){if(!testPass){removeHTMLClass();}},3000);runTests();applyDocReadyHack();windowLoad(function(){windowLoaded=true;});};enhance.defaultTests={getById:function(){return !!doc.getElementById;},getByTagName:function(){return !!doc.getElementsByTagName;},createEl:function(){return !!doc.createElement;},boxmodel:function(){var newDiv=doc.createElement("div");newDiv.style.cssText="width: 1px; padding: 1px;";body.appendChild(newDiv);var divWidth=newDiv.offsetWidth;body.removeChild(newDiv);return divWidth===3;},position:function(){var newDiv=doc.createElement("div");newDiv.style.cssText="position: absolute; left: 10px;";body.appendChild(newDiv);var divLeft=newDiv.offsetLeft;body.removeChild(newDiv);return divLeft===10;},floatClear:function(){var pass=false,newDiv=doc.createElement("div"),style='style="width: 5px; height: 5px; float: left;"';newDiv.innerHTML="<div "+style+"></div><div "+style+"></div>";body.appendChild(newDiv);var childNodes=newDiv.childNodes,topA=childNodes[0].offsetTop,divB=childNodes[1],topB=divB.offsetTop;if(topA===topB){divB.style.clear="left";topB=divB.offsetTop;if(topA!==topB){pass=true;}}body.removeChild(newDiv);return pass;},heightOverflow:function(){var newDiv=doc.createElement("div");newDiv.innerHTML='<div style="height: 10px;"></div>';newDiv.style.cssText="overflow: hidden; height: 0;";body.appendChild(newDiv);var divHeight=newDiv.offsetHeight;body.removeChild(newDiv);return divHeight===0;},ajax:function(){var xmlhttp=false,index=-1,factory,XMLHttpFactories=[function(){return new XMLHttpRequest();},function(){return new ActiveXObject("Msxml2.XMLHTTP");},function(){return new ActiveXObject("Msxml3.XMLHTTP");},function(){return new ActiveXObject("Microsoft.XMLHTTP");}];while((factory=XMLHttpFactories[++index])){try{xmlhttp=factory();}catch(e){continue;}break;}return !!xmlhttp;},resize:function(){return win.onresize!=false;},print:function(){return !!win.print;}};enhance.defaultSettings={testName:"enhanced",loadScripts:[],loadStyles:[],queueLoading:true,appendToggleLink:true,forcePassText:"View high-bandwidth version",forceFailText:"View low-bandwidth version",tests:enhance.defaultTests,addTests:{},alertOnFailure:false,onPass:function(){},onFail:function(){},onLoadError:addIncompleteClass,onScriptsLoaded:function(){}};function cookiesSupported(){return !!doc.cookie;}enhance.cookiesSupported=cookiesSupported();function forceFail(){createCookie(settings.testName,"fail");win.location.reload();}if(enhance.cookiesSupported){enhance.forceFail=forceFail;}function forcePass(){createCookie(settings.testName,"pass");win.location.reload();}if(enhance.cookiesSupported){enhance.forcePass=forcePass;}function reTest(){eraseCookie(settings.testName);win.location.reload();}if(enhance.cookiesSupported){enhance.reTest=reTest;}function addFakeBody(){fakeBody=doc.createElement("body");docElem.insertBefore(fakeBody,docElem.firstChild);body=fakeBody;}function removeFakeBody(){docElem.removeChild(fakeBody);body=doc.body;}function runTests(){var result=readCookie(settings.testName);if(result){if(result==="pass"){enhancePage();settings.onPass();}else{settings.onFail();removeHTMLClass();}if(settings.appendToggleLink){windowLoad(function(){appendToggleLinks(result);});}}else{var pass=true;addFakeBody();for(var name in settings.tests){pass=settings.tests[name]();if(!pass){if(settings.alertOnFailure){alert(name+" failed");}break;}}removeFakeBody();result=pass?"pass":"fail";createCookie(settings.testName,result);if(pass){enhancePage();settings.onPass();}else{settings.onFail();removeHTMLClass();}if(settings.appendToggleLink){windowLoad(function(){appendToggleLinks(result);});}}}function windowLoad(callback){if(windowLoaded){callback();}else{var oldonload=win.onload;win.onload=function(){if(oldonload){oldonload();}callback();};}}function appendToggleLinks(result){if(!settings.appendToggleLink||!enhance.cookiesSupported){return;}if(result){var a=doc.createElement("a");a.href="#";a.className=settings.testName+"_toggleResult";a.innerHTML=result==="pass"?settings.forceFailText:settings.forcePassText;a.onclick=result==="pass"?enhance.forceFail:enhance.forcePass;doc.getElementById("footerwrap").appendChild(a);}}function removeHTMLClass(){docElem.className=docElem.className.replace(settings.testName,"");}function enhancePage(){testPass=true;if(settings.loadStyles.length){appendStyles();}if(settings.loadScripts.length){appendScripts();}else{settings.onScriptsLoaded();}}function toggleMedia(mediaA,mediaB){if(readCookie(mediaCookieA)&&readCookie(mediaCookieB)){eraseCookie(mediaCookieA);eraseCookie(mediaCookieB);}else{createCookie(mediaCookieA,mediaA);createCookie(mediaCookieB,mediaB);}win.location.reload();}enhance.toggleMedia=toggleMedia;function mediaSwitch(q){if(toggledMedia.length==2){if(q==toggledMedia[0]){q=toggledMedia[1];}else{if(q==toggledMedia[1]){q=toggledMedia[0];}}}return q;}function addIncompleteClass(){var errorClass=settings.testName+"-incomplete";if(docElem.className.indexOf(errorClass)===-1){docElem.className+=" "+errorClass;}}function appendStyles(){var index=-1,item;while((item=settings.loadStyles[++index])){var link=doc.createElement("link");link.type="text/css";link.rel="stylesheet";link.onerror=settings.onLoadError;if(typeof item==="string"){link.href=item;head.appendChild(link);}else{if(item.media){item.media=mediaSwitch(item.media);}if(item.excludemedia){item.excludemedia=mediaSwitch(item.excludemedia);}for(var attr in item){if(attr!=="iecondition"&&attr!=="excludemedia"){link.setAttribute(attr,item[attr]);}}var applies=true;if(item.media&&item.media!=="print"&&item.media!=="projection"&&item.media!=="speech"&&item.media!=="aural"&&item.media!=="braille"){applies=mediaquery(item.media);}if(item.excludemedia){applies=!mediaquery(item.excludemedia);}if(item.iecondition){applies=isIE(item.iecondition);}if(applies){head.appendChild(link);}}}}var isIE=(function(){var cache={},b;return function(condition){if(/*@cc_on!@*/true){return false;}var cc="IE";if(condition){if(condition!=="all"){if(!isNaN(parseFloat(condition))){cc+=" "+condition;}else{cc=condition;}}}if(cache[cc]===undefined){b=b||doc.createElement("B");b.innerHTML="<!--[if "+cc+"]><b></b><![endif]-->";cache[cc]=!!b.getElementsByTagName("b").length;}return cache[cc];};})();var mediaquery=(function(){var cache={},testDiv=doc.createElement("div");testDiv.setAttribute("id","ejs-qtest");return function(q){if(cache[q]===undefined){addFakeBody();var styleBlock=doc.createElement("style");styleBlock.type="text/css";var cssrule="@media "+q+" { #ejs-qtest { position: absolute; width: 10px; } }";if(styleBlock.styleSheet){styleBlock.styleSheet.cssText=cssrule;}else{styleBlock.appendChild(doc.createTextNode(cssrule));}head.appendChild(styleBlock);body.appendChild(testDiv);var divWidth=testDiv.offsetWidth;body.removeChild(testDiv);head.removeChild(styleBlock);removeFakeBody();cache[q]=(divWidth==10);}return cache[q];};})();enhance.mediaquery=mediaquery;function appendScripts(){settings.queueLoading?appendScriptsSync():appendScriptsAsync();}function appendScriptsSync(){var queue=[].concat(settings.loadScripts);function next(){if(queue.length===0){return false;}var item=queue.shift(),script=createScriptTag(item),done=false;if(script){script.onload=script.onreadystatechange=function(){if(!done&&(!this.readyState||this.readyState=="loaded"||this.readyState=="complete")){done=true;if(next()===false){settings.onScriptsLoaded();}this.onload=this.onreadystatechange=null;}};head.insertBefore(script,head.firstChild);}else{return next();}}next();}function appendScriptsAsync(){var index=-1,item;while((item=settings.loadScripts[++index])){var script=createScriptTag(item);if(script){head.insertBefore(script,head.firstChild);}}settings.onScriptsLoaded();}function createScriptTag(item){var script=doc.createElement("script");script.type="text/javascript";script.onerror=settings.onLoadError;if(typeof item==="string"){script.src=item;return script;}else{if(item.media){item.media=mediaSwitch(item.media);}if(item.excludemedia){item.excludemedia=mediaSwitch(item.excludemedia);}for(var attr in item){if(attr!=="iecondition"&&attr!=="media"&&attr!=="excludemedia"){script.setAttribute(attr,item[attr]);}}var applies=true;if(item.media){applies=mediaquery(item.media);}if(item.excludemedia){applies=!mediaquery(item.excludemedia);}if(item.iecondition){applies=isIE(item.iecondition);}return applies?script:false;}}function createCookie(name,value,days){days=days||90;var date=new Date();date.setTime(date.getTime()+(days*24*60*60*1000));var expires="; expires="+date.toGMTString();doc.cookie=name+"="+value+expires+"; path=/";}function readCookie(name){var nameEQ=name+"=";var ca=doc.cookie.split(";");for(var i=0;i<ca.length;i++){var c=ca[i];while(c.charAt(0)==" "){c=c.substring(1,c.length);}if(c.indexOf(nameEQ)==0){return c.substring(nameEQ.length,c.length);}}return null;}function eraseCookie(name){createCookie(name,"",-1);}function applyDocReadyHack(){if(doc.readyState==null&&doc.addEventListener){doc.addEventListener("DOMContentLoaded",function DOMContentLoaded(){doc.removeEventListener("DOMContentLoaded",DOMContentLoaded,false);doc.readyState="complete";},false);doc.readyState="loading";}}})(window,document);