function GetXmlHttpObject() {
	var xmlHttp=null;
	try { /* Firefox, Opera 8.0+, Safari, etc */
		xmlHttp=new XMLHttpRequest();
	}
	catch (erro) { /* Microsoft Internet Explorer */
		try	{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (erro) {
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}