newwindow=false;
function fenster(url,breite,hoehe) {
  if(newwindow&&newwindow.closed==false)
    newwindow.close()
    var l = (screen.width - breite) / 2;
    var t = (screen.height - hoehe) / 2;
    newwindow = window.open(url,"newwindow","scrollbars=1, width=" + breite +
                                            ", height=" + hoehe +
                                            ", left=" + l +
                                            ", top=" + t + ";");
  newwindow.focus();
}