function getXMLHTTP()
{   var xmlhttp;
    if(window.ActiveXObject)
    {
        try
        {
            xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch(e)
        {
            try
            {
                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch(e)
            {
                xmlhttp = false;
            }
        }
    }
    else
    {
        try
        {
            xmlhttp = new XMLHttpRequest();
        }
        catch(e)
        {
            xmlhttp = false;
        }
    }
    return xmlhttp;
}