function daumenKino(div) {
    var $alt = $(div+' img.obersteebene');
 
 
  if($alt.next().length)
    var $neu = $alt.next();
  else
    var $neu = $(div+' img:first');


    $alt.addClass('mittlereebene');
    $alt.removeClass('obersteebene');
    $neu.css({opacity: 0.0});
    $neu.addClass('obersteebene');
    $neu.animate({opacity: 1.0}, 2000, function() {
            $alt.removeClass('mittlereebene');
     });
     }