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