function switchlayer(Layer_Name)
{
  elm = document.getElementById(Layer_Name);
  bgelm = document.getElementById('bg'+Layer_Name);
  
  if(elm.style.display=='block') {
        elm.style.display='none';
          bgelm.className = 'aufklappen';
  }
  else {
        elm.style.display='block';
      bgelm.className = 'zuklappen';
  }
}


function preselectlayer(Layer_Name_PreFix, Get_Parameter)
{
    if(!Layer_Name_PreFix) {
        Layer_Name_PreFix = 'nummer';
    }    
    if(!Get_Parameter) {
        Get_Parameter = 'subpage';
    }
    URL_Parameter = window.location.search;
    if(URL_Parameter.indexOf(Get_Parameter) > 0) {
        switchlayer(Layer_Name_PreFix + URL_Parameter.substr(URL_Parameter.indexOf(Get_Parameter)).split('&')[0].split('=')[1]);
    }
}