function wopen(url, w, h)
{
        // Fudge factors for window decoration space.
        // In my tests these work well on all platforms & browsers.
        w += 32;
        h += 96;
        var win = window.open(url,
                'popup', 
                'width=' + w + ', height=' + h + ', ' +
                'location=no, menubar=no, ' +
                'status=no, toolbar=no, scrollbars=no, resizable=no');
        win.resizeTo(w, h);
        win.focus();
}