timer=0
  timer2=0

  function auf(nam)
    {
    if (document.all)
      {
      document.all[nam].style.visibility="visible";
      }
    if (document.layers)
      {
      document.layers[nam].visibility="show";
      }
    if(document.getElementById)
      {
      document.getElementById(nam).style.visibility="visible";
      }
    }
  function zu(nam)
    {
    if (document.all)
      {
      document.all[nam].style.visibility="hidden";
      }
    if (document.layers)
      {
      document.layers[nam].visibility="hide";
      }
    if(document.getElementById)
      {
      document.getElementById(nam).style.visibility="hidden";
      }
    }