/** */

function flipBook() {
  var $alt = $('#myGallery div.top_layer');

  if($alt.next().length)
    var $neu = $alt.next();
  else
    var $neu = $('#myGallery div:first');

  $alt.addClass('middle_layer');
  $alt.removeClass('top_layer');
  $neu.css({opacity: 0.0});
  $neu.addClass('top_layer');

  $neu.animate({opacity: 1.0}, 4000, function() {
    $alt.removeClass('middle_layer');
  });
}

$(document).ready(function() { setInterval( "flipBook()", 6000 ); });