function anz_wechseln (menu)
{
  if (document.getElementById(menu).style.display == "none")
  {
	init_menu (menu.slice(4));
  }
  else
  {
   document.getElementById(menu).style.display = "none";
  }
}

function init_menu (offen)
{
  var obj = document.getElementById("menu");
  var i = 0;
  
  try
  {
    while (true)
    {
      obj.getElementsByTagName("ul")[i].style.display = "none";
      i++;
    }
  }
  catch (e)
  {
    if ((offen != "") && (offen >= 0))
    {
      document.getElementById("menu" + offen).style.display = "list-item";
    }
  }
}