var strOldPreId = null;

function show(strPreId){
  if(strPreId != strOldPreId){
    if(strOldPreId != null){
      // Offene Togglebox schliessen
      document.getElementById(strOldPreId+"_toggle").style.display = "none";
      document.getElementById(strOldPreId+"_link").style.display = "";
    }

    document.getElementById(strPreId+"_toggle").style.display = "block";
    document.getElementById(strPreId+"_link").style.display = "none";
    strOldPreId = strPreId;
  }else{
    document.getElementById(strPreId+"_toggle").style.display = "none";
    document.getElementById(strPreId+"_link").style.display = "";
    strOldPreId = null;
  }
}