function criaXMLHttp(){if(typeof XMLHttpRequest !="undefined") return new XMLHttpRequest();else if(typeof ActiveXObject !="undefined"){var aVersoes=["MSXML2.XMLHttp.6.0","MSXML2.XMLHttp.5.0","MSXML2.XMLHttp.4.0","MSXML2.XMLHttp.3.0","MSXML2.XMLHttp","Microsoft.XMLHttp"];for(var i=0;i<aVersoes.length;i++){try{return new ActiveXObject(aVersoes[i]);}catch(e){}}}throw new Error("Seu browser nao suporta AJAX");}