gistfile1.js

$('section.content img').each(function() {
  var me = $(this);
  var src = me.attr('src');
  
  me.wrap('<figure class="image-wrapper ' + me.attr('title') + '" />')
    .after('<figcaption>' + $(this).attr('alt') + '</figcaption>')
    .attr('src', './content/' + src);
});