app/views/content_viewer/_uploaded_file.html.erb
<% if uploaded_file.image? %>
<%= link_to '',
uploaded_file.view_url,
:class => 'image',
:style => 'background-image: url(%s)'% [Noosfero.root, uploaded_file.public_filename(:thumb)].join
%>
<span><%=h uploaded_file.title %></span>
<% else %>
<%= render :partial => 'article', :object => uploaded_file %>
<% end %>