var http_request;

function criaObjHTTP()
{
	var ie = /msie/i.test(navigator.userAgent);
	if (ie)
		http = new ActiveXObject("Microsoft.XMLHTTP");
	else
		http = new XMLHttpRequest();

	return http;
}

function loadXMLDoc(endereco)
{
	http_request = criaObjHTTP();

	http_request.onreadystatechange = ProcessaReturn;
	http_request.open("GET", endereco, true);

	http_request.send(null);
}

function ProcessaReturn()
{
	if (http.readyState == 4) 
	{
		httpRetorno(http_request);
		//http.responseText
	}
}