title: Jquery addClass with delay
body: <p>I have a basic menu like this:</p>
  
  <pre><code>&lt;ul&gt;
      &lt;li&gt;item 1&lt;/li&gt;
      &lt;li&gt;item2&lt;/li&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p>How can I add the class "current" for each one of my <code>&lt;li&gt;</code> elements every 800 ms, and of course delete the old current element?</p>