function processReqChange() {

	// only if req shows "complete"
	if (req.readyState == 4) {
		// only if "OK"
		if (req.status == 200) {
			// ...processing statements go here...
			response = req.responseXML.documentElement;

			method = response.getElementsByTagName('method')[0].firstChild.data;

			result = response.getElementsByTagName('result')[0].firstChild.data;

			eval(method + '(result,response)');

		} else {

			alert("There was a problem retrieving the XML data:\n" + req.statusText);

		}
	}
}


function loadXMLDoc(url,post)
{
	// branch for native XMLHttpRequest object
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
		req.onreadystatechange = processReqChange;
		req.open("POST", url, true);
		req.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
		req.send(post);
		// branch for IE/Windows ActiveX version
	} else if (window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req) {
			req.onreadystatechange = processReqChange;
			req.open("POST", url, true);
			req.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
			req.send(post);
		}
	}
}