function closemenus() { 
  parent.document.all['unterkuenfte'].style.visibility='hidden';
  parent.document.all['kultur'].style.visibility='hidden';
  parent.document.all['freizeizt'].style.visibility='hidden';
  parent.document.all['gastronomie'].style.visibility='hidden';
  parent.document.all['radbus'].style.visibility='hidden';
  parent.document.all['stadtplan'].style.visibility='hidden';
}