ensl.org/app/views/articles/_top.html.erb

<div class="articleLinks">
  <% if article.previous_article %>
    <div class="left">
      <%= link_to "<< #{article.previous_article}", article.previous_article %>
    </div>
  <% end %>

  <% if article.next_article %>
    <div class="right">
      <%= link_to "#{article.next_article} >>", article.next_article %>
    </div>
  <% end %>
</div>