code: function(node, index) {
          node = $(node);
  
          this.fireEvent('showing', [node]);
  
          // Set the item being loaded for so that events can be fired
          this.element = node.removeClass(this.options.lazyClass.substr(1));
  
          // Replace src attributes on images
          node.find('img').each(function() {
              var image = $(this), src;
  
              if (Toolkit.isRetina) {
                  src = image.data('src-retina');
              }
  
              if (!src) {
                  src = image.data('src');
              }
  
              if (src) {
                  image.attr('src', src);
              }
          });
  
          // Replace item with null since removing from the array causes it to break
          this.items.splice(index, 1, null);
          this.loaded++;
  
          this.fireEvent('shown', [node]);
      }
docs: Show the item by removing the lazy load class.
  
  @param {jQuery} node
  @param {Number} index