function createXMLHttpRequest() {
	var req = null;
	try {
		req = new ActiveXObject("MSXML2.XMLHTTP");
	}
	catch (err_MSXML2) {
		try {
			req = new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch (err_Microsoft) {
			if (typeof XMLHttpRequest != "undefined") 
				req = new XMLHttpRequest;
		}
	}
	return req;
}