function Ajax()
{
var xhReq, processed = false;
xhReq = getReqObj();
if (!xhReq) return null;

this.getXml = function(req_url, req_data, req_div, call_back_function)
{
if (!xhReq) return false;

processed = false;

try 
{
xhReq.open("GET", req_url + ((req_data != "") ? "?" : "") + req_data, true);
req_data = "";

xhReq.onreadystatechange = function()
{
if (xhReq.readyState == 4)
{
if ( (xhReq.status == 200) && !processed)
{
processed = true;
call_back_function(req_div, xhReq);
}
}
};
xhReq.send(req_data);
}
catch(ex) 
{ 
return false; 
}
return true;
};
return this;
}

function getReqObj()
{
var req;
req = false;
if(window.ActiveXObject) {
// IE/Windows ActiveX version
try {
req = new ActiveXObject("Msxml2.XMLHTTP");
} catch(ex) {
try {
req = new ActiveXObject("Microsoft.XMLHTTP");
} catch(ex) {
req = false;
}
}
}
else if(window.XMLHttpRequest) {
// native XMLHttpRequest 
try {
req = new XMLHttpRequest();
} catch(ex) {
req = false;
}
} 
return req;
}

function displayDivHtml(req_div, xhReq)
{
var response = xhReq.responseText;

if (response == null)
return;

document.getElementById(req_div).innerHTML = xhReq.responseText;
document.getElementById(req_div).style.display = '';
}