Rails - Aug 2014 - jQuery Plugins For Simple Image Gallery

Dear all Developers,
i have try jquery image plugin call " 
jQuery-Plugins-For-Simple-Image-Gallery-with-Magnifying-Glass-Effect ".
but i got message when view. it doesn't show image. i don't know why?
this is my view code 

  <%= stylesheet_link_tag 'jquery.simpleGallery.css' %>
  <%= stylesheet_link_tag 'jquery.simpleLens.css' %>
  <%= javascript_include_tag 'jquery.simpleGallery.js' %>
  <%= javascript_include_tag 'jquery.simpleLens.js' %>

<div class="simpleLens-gallery-container" id="demo-1">
                <div class="simpleLens-container">
                    <div class="simpleLens-big-image-container">
                        <a class="simpleLens-lens-image" 
data-lens-image='a.jpg'>
                            <%= image_tag @blog.image.url, 
class:"simpleLens-big-image" %>
                        </a>
                    </div>
                </div>
 </div>

thanks.    

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