function openWindow(url, w, h)
{
    var padding;
    (navigator.appName == "Microsoft Internet Explorer") ? (padding = 10) : (padding = 0);

    var screenw = screen.availWidth;
    var screenh = screen.availHeight;
    var winw = (w + 15 + padding);
    var winh = (h + 15 + padding);
    var posx = (screenw / 2) - (winw / 2);
    var posy = (screenh / 2) - (winh / 2);

    var mywin = window.open(url,"mywin","top="+posy+",left="+posx+",width="+winw+",height="+winh+",menubar=no,locationbar=no,statusbar=no,resizable=no,toolbar=no,dependent=yes,scrollbars=no");
    mywin.focus();
}