function Go (select) {
  var wert = select.options[select.options.selectedIndex].value;
  if (wert == "leer") {
    select.form.reset();
    parent.frames["unten"].focus();
    return;
  } else {
    if (wert == "ende") {
      top.location.href = parent.frames[1].location.href;
    } else {
      parent.frames["unten"].location.href = wert;
      select.form.reset();
      parent.frames["unten"].focus();
    }
  }
}