var win = null;

    function NewWindow(mypage, myname, w, h, scroll)
        {
        LeftPosition = (screen.width) ? (screen.width - w) / 2 : 0;
        TopPosition = (screen.height) ? (screen.height - h) / 2 : 0;
        settings = 'height=' + h + ',width=' + w + ',top=' + TopPosition + ',left=' + LeftPosition + ',scrollbars=' + scroll + ', resizable=no, directories, location, status'
        win = window.open(mypage, myname, settings)
        }