title: Add something after the "n" element using jQuery
body: <p>For a markup like</p>
  <pre><code>&lt;div id=&quot;holder&quot;&gt;
      &lt;div&gt;div 1&lt;/div&gt;
      &lt;div&gt;div 2&lt;/div&gt;
      &lt;div&gt;div 3&lt;/div&gt;
      &lt;div&gt;div 4&lt;/div&gt;
  &lt;/div&gt; 
  </code></pre>
  <p>how do add some markup after the second DIV for instance?</p>