/* Função para criar o objeto XMLHttpRequest */
function openAjax(){
	
	try{
		var ajax = new XMLHttpRequest();
	}
	catch(e){
		try{
			var ajax = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(ee){
			try{
				var ajax = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(eee){
			    var ajax = false;
			}
		}
	}
	
	return ajax;
}