var getElementsByClassName=function(className,tag,elm){if(document.getElementsByClassName){getElementsByClassName=function(className,tag,elm){elm=elm||document;var elements=elm.getElementsByClassName(className),nodeName=(tag)?new RegExp("\\b"+tag+"\\b","i"):null,returnElements=[],current;for(var i=0,il=elements.length;i<il;i+=1){current=elements[i];if(!nodeName||nodeName.test(current.nodeName)){returnElements.push(current)}}return returnElements}}else if(document.evaluate){getElementsByClassName=function(className,tag,elm){tag=tag||"*";elm=elm||document;var classes=className.split(" "),classesToCheck="",xhtmlNamespace="http://www.w3.org/1999/xhtml",namespaceResolver=(document.documentElement.namespaceURI===xhtmlNamespace)?xhtmlNamespace:null,returnElements=[],elements,node;for(var j=0,jl=classes.length;j<jl;j+=1){classesToCheck+="[contains(concat(' ', @class, ' '), ' "+classes[j]+" ')]"}try{elements=document.evaluate(".//"+tag+classesToCheck,elm,namespaceResolver,0,null)}catch(e){elements=document.evaluate(".//"+tag+classesToCheck,elm,null,0,null)}while((node=elements.iterateNext())){returnElements.push(node)}return returnElements}}else{getElementsByClassName=function(className,tag,elm){tag=tag||"*";elm=elm||document;var classes=className.split(" "),classesToCheck=[],elements=(tag==="*"&&elm.all)?elm.all:elm.getElementsByTagName(tag),current,returnElements=[],match;for(var k=0,kl=classes.length;k<kl;k+=1){classesToCheck.push(new RegExp("(^|\\s)"+classes[k]+"(\\s|$)"))}for(var l=0,ll=elements.length;l<ll;l+=1){current=elements[l];match=false;for(var m=0,ml=classesToCheck.length;m<ml;m+=1){match=classesToCheck[m].test(current.className);if(!match){break}}if(match){returnElements.push(current)}}return returnElements}}return getElementsByClassName(className,tag,elm)};