anchor.diff:  		</div>
   	</div>
   </div>
  -<!-- end related -->+<!-- end related -->
  +<% content_for :extra_headers do %>
  +  <%- if @guide.has_previous_part?(@part) -%>
  +    <link rel="prev" href="<%= guide_path(@guide.slug, @guide.part_before(@part).slug,@edition) %>" />
  +  <%- end -%>
  +  <%- if @guide.has_next_part?(@part) -%>
  +    <link rel="next" href="<%= guide_path(@guide.slug, @guide.part_after(@part).slug,@edition) %>" />
  +  <%- end -%>
  +<% end %>
positive.code:  	      <nav class="pagination" role="navigation">
             <ul class="group">
   	        <%- if @guide.has_previous_part?(@part) -%>
   	          <li class="previous" rel="previous">
  							<a href="<%= guide_path(@guide.slug, @guide.part_before(@part).slug,@edition) %>" title="Navigate to previous part">
  							  <span class="pagination-label">&larr; Part <%= part_number(@guide.parts, @guide.part_before(@part)) %></span> <%= (@guide.part_before(@part).title) %></a>
                </li>
              <%- else -%>
                <li class="first" rel="previous">
                  You are at the beginning of this guide
                </li>
   	        <%- end -%>
   	        <%- if @guide.has_next_part?(@part) -%>
  						<li class="next" rel="next">
  							<a href="<%= guide_path(@guide.slug, @guide.part_after(@part).slug,@edition) %>" title="Navigate to next part"><span class="pagination-label">Next part (<%= part_number(@guide.parts, @guide.part_after(@part)) %> of <%= @guide.parts.length %>) &rarr;</span> <%= (@guide.part_after(@part).title) %></a>
                  </li>
              <%- else -%>
                <li class="last" rel="next">
                  You have reached the end of this guide
                </li>
   	        <%- end -%>
  
negative.code: 		<% if ! @guide.video_url.blank? %>
  		<div class="alternative-guide video">
  		  <%video_id = @guide.video_url.scan(/\?v=([A-Za-z0-9_\-]+)/) %>
  			<a class="video-overlay" href="<%= guide_path(@guide.slug, 'video',@edition) %>#video" title="Watch the video version of this guide"></a>
  			<img src="http://img.youtube.com/vi/<%=video_id[0][0]%>/1.jpg" width="120" height="96" alt="Watch the video version of this guide">
  			<a href="<%= guide_path(@guide.slug, 'video',@edition) %>"><span>Watch video version</span></a>
  		</div>
  