<!--
function doPostback(callbackFunction, url, vars) {
	var request = null;
	request = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("MSXML2.XMLHTTP.3.0");
 
	if (url.indexOf("?")>0) {
		url = url + "&" + Math.random();
	} else {
		url = url + "?" + Math.random();
	}
	request.open("POST", url, true);
	request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
	request.setRequestHeader("Content-length", vars.length);
	request.setRequestHeader("Connection", "close");
	request.onreadystatechange = function(){
		if (request.readyState == 4) {
			callbackFunction(request.responseText);	
			request = null;
		}
	};
	request.send(vars);
}
-->