var anzObj = 0;

  function laden(name,erstes,zweites,drittes){
    if(browserOK){
      Bilder[anzObj]        = new Array(4);
      Bilder[anzObj][0]     = new Image();
      Bilder[anzObj][0].src = erstes;
      Bilder[anzObj][1]     = new Image();
      Bilder[anzObj][1].src = zweites;
      Bilder[anzObj][2]     = new Image();
      Bilder[anzObj][2].src = drittes;
      Bilder[anzObj][3]     = name;
      anzObj++;
    }
  }

  function over(name){
    if(browserOK){
      for(i=0;i<anzObj;i++){
        if(document.images[Bilder[i][3]] != null){
          if(name != Bilder[i][3]){
            //alle anderen Bilder zurücksetzen
            document.images[Bilder[i][3]].src = Bilder[i][0].src;
          } else {
            document.images[Bilder[i][3]].src = Bilder[i][1].src;
          }
        }
      }  
    }    
  }

  function out(){
    if(browserOK){
      //alle Bilder zurücksetzen
      for(i=0;i<anzObj;i++){
        if(document.images[Bilder[i][3]] != null){
          document.images[Bilder[i][3]].src = Bilder[i][0].src;
        }
      }
    }
  }

  function clicked(name,URL){
    if(browserOK){
      for(i=0;i<anzObj;i++){
        if(document.images[Bilder[i][3]] != null){
          if(name != Bilder[i][3]){
            //alle anderen Bilder zurücksetzen
            document.images[Bilder[i][3]].src = Bilder[i][0].src;
          } else {
            document.images[Bilder[i][3]].src = Bilder[i][2].src;
            wechseln(URL);
          }
        }
      }  
    }
  }

  //Bilder in den Speicher laden
  laden("home", "./Img/home/home_norm.JPG", "./Img/home/home_active.JPG", "./Img/home/home_clicked.JPG");
  laden("about", "./Img/about/about_norm.JPG", "./Img/about/about_active.JPG", "./Img/about/about_clicked.JPG");
  laden("demos", "./Img/demos/demos_norm.JPG", "./Img/demos/demos_active.JPG", "./Img/demos/demos_clicked.JPG");
  laden("booking", "./Img/booking/booking_norm.JPG", "./Img/booking/booking_active.JPG", "./Img/booking/booking_clicked.JPG");

  function wechseln(URL){
    parent.rechts.location.href = URL;
  }