function createAjax()
{
    try
    {
        var xmlHttp = new XMLHttpRequest();
    }
    catch(err)
    {
        var ieXml = new Array();
        ieXml[ieXml.length] = "MSXML2.XMLHttp.7.0";
        ieXml[ieXml.length] = "MSXML2.XMLHttp.6.0";
        ieXml[ieXml.length] = "MSXML2.XMLHttp.5.0";
        ieXml[ieXml.length] = "MSXML2.XMLHttp.4.0";
        ieXml[ieXml.length] = "MSXML2.XMLHttp.3.0";
        ieXml[ieXml.length] = "MSXML2.XMLHttp";
        ieXml[ieXml.length] = "Microsoft.XMLHttp";
        
        var i;
        for (i=0; i < ieXml.length; i++)
        {
            try
            {
                var xmlHttp = new ActiveXObject(ieXml[i]);
                alert(xmlHttp);
            }
            catch(err2)
            {
                return false;
            }
        }
    }
    
    if (typeof(xmlHttp) == "undefined")
    {
        alert("AJAX Is not supported on your browser. Please update It.");
    }
}