title: jQuery :nth-child not working in IE
body: <p>I am using this code</p>
  
  <pre><code>$('.list-item:nth-child(5n)').after('&lt;div class="clear"&gt;&lt;img src="http://domain.com/image.jpg" width="780" height="80" alt="banner" /&gt;&lt;/div&gt;')
  </code></pre>
  
  <p>This works fine in Firefox and Chrome but not working in IE8, IE9...</p>