Highlight external links.
diff --git a/org.jacoco.doc/docroot/doc/implementation.html b/org.jacoco.doc/docroot/doc/implementation.html
index 3f9b70b..b9b6b7a 100644
--- a/org.jacoco.doc/docroot/doc/implementation.html
+++ b/org.jacoco.doc/docroot/doc/implementation.html
@@ -13,6 +13,7 @@
   <a href="index.html" class="el_group">Documentation</a> &gt;

   <span class="el_source">Implementation Design</span>

 </div>

+<div id="content"> 

 

 <h1>Implementation Design</h1>

 

@@ -306,6 +307,7 @@
   bundles can also be used like regular JAR files.  

 </p>

 

+</div>

 <div class="footer">

   <div class="versioninfo"><a href="@HOMEURL@">JaCoCo</a> @VERSION@</div>

   <a href="license.html">Copyright</a> &copy; 2009, 2010 Mountainminds GmbH &amp; Co. KG and Contributors