anchor.diff:  <%= form_for(@site, :url => admin_site_path(@site), :html => { :multipart => true }) do |f| %>
  -
  -  <%= f.error_messages %>
  -
   
     <div class="common">
       <h3>SITE CUSTOMIZATION</h3>
  
positive.code:           <div id="wrapper_input">
              <%= f.file_field :aid_map_image %>
            </div>
          </div>    
          <% if @site.aid_map_image_file_name? %>
            <p class="remove_link"> or <%= link_to('remove', destroy_aid_map_image_admin_site_path(@site), :method => :put, :class => 'remove') %></p>
           <% else %>
              <p class="message remove_link">Select a file from your computer</p>          
          <%end%>
        </div>
      </div>
  
negative.code:           <div id="wrapper_input">
              <%= f.file_field :logo %>
            </div>
          </div>
          <% if @site.logo_file_name? %>
            <p class="remove_link"> or <%= link_to('remove', destroy_logo_admin_site_path(@site), :method => :put, :class => 'remove') %></p>
           <% else %>
              <p class="message remove_link">Select a file from your computer</p>
          <%end%>
        </div>
      </div>
  