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