source/_includes/custom/after_footer.html
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 <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
 <script src="//cdnjs.cloudflare.com/ajax/libs/fancybox/2.1.4/jquery.fancybox.pack.js"></script>
 <script>
 $(function() {
   $('.entry-content').each(function(i){
     var _i = i;
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   $('.fancybox').fancybox();
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 </script>