var req;

function loadXMLDoc(url) {
    // branch for native XMLHttpRequest object
    if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
        req.onreadystatechange = processReqChange;
        req.open("GET", url, true);
        req.send(null);
    // branch for IE/Windows ActiveX version
    } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        if (req) {
            req.onreadystatechange = processReqChange;
            req.open("GET", url, true);
            req.send();
        }
    }
}


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