Lazy loading with Backbone isn't working

Question

I'm trying to use this lazy loading plugin in a backbone app, I adapted the template to work with the plugin and called and the plugin script in but when I update the browser it seems that all the views images are already rendered, so the lazy loading isn't working properly.

Here is the Fiddle: http://jsfiddle.net/9R9zU/55/

I'm using the lazy loading here:

app.BookView = Backbone.View.extend ({
  tagName: 'div',
  className: 'book',
  template: _.template( $( '#bookTemplate' ).html()),
  render: function() {
     this.$el.html(this.template(this.model.toJSON()));
     this.$el.find("img").unveil();//lazy loading
     return this;
  }
});