function GetXmlHttpObject()
{
    var xmlObj;

    try
    {    // Firefox, Opera 8.0+, Safari
        xmlObj = new XMLHttpRequest();
    }
    catch (e)
    {    // Internet Explorer
        try
        {
            xmlObj = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e)
        {
            try
            {
                xmlObj = new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch (e)
            {
                alert("Your browser does not support AJAX!");
                return false;
            }
        }
    }
    return xmlObj;
}