title: How to place a link on the middle of a div in height?
body: <p>How do I place the link Refresh on the middle in height of the div nav_bar?</p>
  
  <pre><code>&lt;div id="nav_bar"&gt;
  &lt;a class="nav" id="refresh" href="#"&gt;Refresh&lt;/a&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Here is a fiddle for more help
  <a href="http://jsfiddle.net/axuxT/" rel="nofollow">http://jsfiddle.net/axuxT/</a></p>