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<nav>
  <!-- Include the class in the Navigation -->
  <ul class="nav {{include.navclass}}">
    <li><a href="{{site.baseurl}}/" class="{% if page.url == '/index.html' %}current{% endif %}">Home</a></li>
    <li><a href="{{site.baseurl}}/planets">Planets</a></li>
    <li><a href="{{site.baseurl}}/news.html" class="{% if page.url == '/news.html' %}current{% endif %}">News</a></li>
   </ul>
</nav>

<!-- _includes/header.html -->
<header>
  <h1>Planets of the Universe</h1>
  {% include nav.html navclass='nav-top' %}
</header>

<!-- _includes/footer.html -->
<footer>
  {% include nav.html navclass='nav-bottom' %}
  <p>Copyright 2013 Planets of the Universe</p>
</footer>