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By default the plugin uses the `href` attribute of the matched elements to obtain the URL of the
large-scale images. You may change this behaviour by providing a `getSource` function:

1. <div class="liquid highlight html+javascript"></div>
   
       <img src="thumb1.jpg" data-large="image1.jpg" />
       <img src="thumb2.jpg" data-large="image2.jpg" />
       <img src="thumb3.jpg"  data-large="image3.jpg" />
       
       <script>
         $('img[data-large]').touchGallery({
           getSource: function() { 
             return $(this).attr('data-large');
           }
         });
       </script>