Missing link in /demos/tabs/index.html to /demos/tabs/vertical.html

diff --git a/demos/tabs/index.html b/demos/tabs/index.html

index c0d6684..3f8953e 100644

--- a/demos/tabs/index.html

+++ b/demos/tabs/index.html

@@ -18,6 +18,7 @@

<li><a href="manipulation.html">Simple manipulation</a></li>

<li><a href="bottom.html">Tabs below content</a></li>

<li><a href="cookie.html">Cookie persistence</a></li>

+ <li><a href="vertical.html">Left tabs</a></li>

</ul>

</div>