function showCar(nTarget) {
    // das sichtbare div ausfaden...
    for (nIndex=0; nIndex<=5; nIndex++) {
      if(nIndex==0) 
        divSource='car'; 
      else {
        divSource='car'+nIndex;

        // auch alle Button zurücksetzen...
        divButton='carbutton'+nIndex;
        $(divButton).className='carbutton car'+nIndex;
      }

      if($(divSource).style.opacity=="" || $(divSource).style.opacity>0) 
        new Effect.Opacity($(divSource), {duration:1, from:1.0, to:0.0});
    }

    // alle div's nach unten legen...
    divTarget='car'+nTarget;
    setTimeout("{$('car').style.zIndex=$('car1').style.zIndex= $('car2').style.zIndex=$('car3').style.zIndex=$('car4').style.zIndex=$('car5').style.zIndex=10; $(divTarget).style.zIndex=100;}", 1000);

    // neues div einblenden...
    new Effect.Opacity($(divTarget), {duration:1, from:0.0, to:1.0});

    // Button aktivieren...
    divButton='carbutton'+nTarget;
    $(divButton).className='carbutton car'+nTarget+nTarget;
  }