var XMLHttpFactories = [
	function () { return new XMLHttpRequest(); },
	function () { return new ActiveXObject("Msxml2.XMLHTTP"); },
	function () { return new ActiveXObject("Msxml3.XMLHTTP"); },
	function () { return new ActiveXObject("Microsoft.XMLHTTP"); }
];
function createXMLHTTPObject() 
{
	var xmlhttp = false;
	for (var i=0; i<XMLHttpFactories.length; i++) {
		try {
			xmlhttp = XMLHttpFactories[i]();
		} catch (e) {
			continue;
		}
		break;
	}
	return xmlhttp;
}