<% comment = if current.respond_to? :comment_location then
               current.comment_location
             else
               current.comment
             end
   table = current.parse(comment).table_of_contents

   if table.length > 1 then %>
<div id="table-of-contents">
  <nav class="section">
    <h3 class="section-header">Table of Contents</h3>
    <ul>
<%   table.each do |heading| %>
      <li><a href="#<%= heading.aref %>"><%= heading.plain_html %></a>
<%   end %>
    </ul>
  </nav>
</div>
<% end %>