FancyBox2 and Bootstrap Carousel - You spin me round!

some.js

/*
   With this afterLoad callback, the bootstrap gallery
   switches pages with the current image displayed in
   the FancyBox modal.
*/
$(".fancybox").fancybox({
    loop : false,
    afterLoad: function(current, previous) {
        if(previous) {
          var carouselItems = 6;  
          if(current.index > previous.index && current.index % carouselItems == 0) {
              $('#myCarousel').carousel('next');
          } else if(current.index < previous.index && previous.index % carouselItems == 0) {
              $('#myCarousel').carousel('prev');
          }
        }
    }
});