function invokeWindow (xUrl, xTitle, xTop, xLft, xWid, xHt)
{
    var posStr;
    if (navigator.appName == "Netscape")
    {
        posStr = ',screenX='+xLft+',screenY='+xTop;
    }
    else
    {
        posStr = ',left='+xLft+',top='+xTop;
    }
    win = open(xUrl, xTitle,
               'toolbar=no,titlebar=no,location=no,directories=no,status=no,menubar=no,resizable=yes,scrollbars=yes,width='+xWid+',height='+xHt+posStr);

}