function winOpen(url, breite, hoehe) {
    links = (screen.width / 2) - (breite / 2);
    oben = (screen.height / 2) - (hoehe / 2);
    window.open(url,"popup","height="+hoehe+",width="+breite+",status=yes,toolbar=yes,menubar=yes,location=no,resizable=yes,titlebar=yes,scrollbars=yes,fullscreen=no,top="+oben+",left ="+links);
}