$(document).ready(function() {

  $("a.fancybox_gallery_item").fancybox({
    'transitionIn'		: 'fade',
    'transitionOut'		: 'fade',
    'titlePosition' 	: 'over',
    'titleFormat'		: function(title, currentArray, currentIndex, currentOpts) {
      return '<span id="fancybox-title-over">Image ' + (currentIndex + 1) + ' / ' + currentArray.length + (title.length ? ' &nbsp; ' + title : '') + '</span>';
    }
  });

});