function MenueAuf(Men)
{
  if(document.getElementById)
  {
    document.getElementById(Men).style.visibility="visible";
  }

  else if(document.all && !document.getElementById)
  {
    document.all[Men].style.visibility="visible";
  }
}

function MenueZu(Men)
{
  if(document.getElementById)
  {
    document.getElementById(Men).style.visibility="hidden";
  }

  else if(document.all && !document.getElementById)
  {
    document.all[Men].style.visibility="hidden";
  }
}