function go(val,txt) {
  if(val == "null") {
    document.groupform.reset();
    document.groupform.groups.blur();
  } else {
    document.groupform.reset();
    document.groupform.groups.blur();
    txt = txt.replace(/ /,"_");
    txt = txt.replace(/-/,"_");
    txt = txt.replace(/\(/,"");
    txt = txt.replace(/\)/,"");
 //   win = location.replace(val,txt,"");   laed in aktuelles Fenster
    win = window.open(val,txt,"");  //oeffnet neues Fenster
  }
}