anchor.diff:  <%= form.inputs do %>
     <%= form.input :title %>
     <%= form.input :type, :as => :select, :collection => ['Image', 'Frame', 'Text'] %>
  -  
  +
     <div class="types image text hidden">
       <%= form.input :link %>
     </div>
  -  
  +
     <div class="types frame <% unless section_module.type == "Frame" %>hidden<% end %>">
       <%= form.input :frame, :collection => {
                                             'Blog'    => 'blog',
  
positive.code:       $('.' + this.value.toLowerCase()).removeClass('hidden');
      })
    </script>
  <% end %>
negative.code:                                           'News'    => 'news'
                                          } %>
    </div>
  
    <div class="types image <% unless section_module.type == "Image" %>hidden<% end %>">
  
      <%= form.inputs "Image file" do %>
  
        <fieldset class='form-horizontal'>
  
          <% if section_module.image %>
  