GECKO = document.getElementById? 1:0 ;
        NS = document.layers? 1:0 ;
        IE = document.all? 1:0 ;

        function haupt(untermenue)
        {
                var hauptmenues = new Array('Drei');

                for (var menue in hauptmenues)
                {
                  var das_menue = hauptmenues[menue];
                  if (GECKO) 
                  {
                    document.getElementById(das_menue).style.display = 'none';

                  }
                  else if (NS) 
                  {
                    document.layers[das_menue].style.display = 'none';

                  }
                  else if (IE) 
                  {
                    document.all[das_menue].style.display = 'none';

                  }
            
                 }


             aufklappen(untermenue);
        }
        
        function unter(untermenue)
        {
           var untermenues = new Array('FunfEins', 'FunfZwei', 'FunfDrei', 'FunfVier');
           
                for (var menue in untermenues)
                {
                    var das_menue = untermenues[menue];
                  
                    if (GECKO)
                    {
                      document.getElementById(das_menue).style.display = 'none';
                    }
                    else if (NS)
                    {
                      document.layers[das_menue].style.display = 'none';
                    }
                    else if (IE)
                    {
                      document.all[das_menue].style.display = 'none';
                    }
                }
           aufklappen(untermenue);
        }

        function aufklappen(untermenue)
        {
        

          if (GECKO) 
          {
            document.getElementById(untermenue).style.display = 'block';
          }
          else if (NS) {document.layers[untermenue].style.display = 'block';}
          else if (IE) {document.all[untermenue].style.display = 'block';}

       }