function Go (select) {

  var wert = select.options[select.options.selectedIndex].value;
  
  if (wert == "leer") {
    select.form.reset();
    this.focus();
    return;
  } 
  
  else {
    if (wert == "ende") {
      //this.location.href = parent.frames[1].location.href;
      this.history.back();
    } 
    else {

      this.location.href = wert;
      select.form.reset();
      this.focus();
     }
  }
}