function popup(title, w, h, url, scroll) {
    var padding;
    if (scroll == 0) {
        scroll = 'no';
    }
    else {
        scroll = 'yes';
    }
    (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,title,"top="+posy+",left="+posx+",width="+winw+",height="+winh+",menubar=no,locationbar=no,statusbar=no,resizable=no,toolbar=no,dependent=yes,scrollbars="+scroll);
    mywin.focus();
}