<li><a href="tests/negative.html">Negative Numbers</a></li>
         <li><a href="tests/noise.html">Noisy Data</a></li>
         <li><a href="tests/two-series.html">Multiple Series</a></li>
-        <li><a href="tests/underlay-callback.html">Custom Underlay / background</a></li>
+        <li><a href="tests/highlighted-region">Custom Underlay / background</a></li>
       </ul>
     </div>
 
           <td><code>boolean</code></td>
           <td><code>false</code></td>
           <td>If the rolling average period text box should be shown.
-          <div class="tests">Tests: <a href="tests/callback.html">callback</a> <a href="tests/crosshair.html">crosshair</a> <a href="tests/fractions.html">fractions</a> <a href="tests/isolated-points.html">isolated-points</a> <a href="tests/numeric-gviz.html">numeric-gviz</a> <a href="tests/underlay-callback.html">underlay-callback</a> </div>
+          <div class="tests">Tests: <a href="tests/callback.html">callback</a> <a href="tests/crosshair.html">crosshair</a> <a href="tests/fractions.html">fractions</a> <a href="tests/isolated-points.html">isolated-points</a> <a href="tests/numeric-gviz.html">numeric-gviz</a> <a href="tests/underlay-callback.html">underlay-callback</a> <a href="tests/highlighted-region.html">highlighted-region</a></div>
           </td>
         </tr>
         <tr>