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=yes,resizable=no'
    win = window.open(mypage, myname, settings)
    if (win.window.focus) { win.window.focus(); }
}