title: Select Nth previous sibling in jQuery?
body: <p>I'm trying to set up my jQuery selector but I'm not exactly sure how I need to write it.</p>
  
  <p>I've got a unordered list that looks something like this:</p>
  
  <pre><code>&lt;ul&gt;
      &lt;li&gt;something&lt;/li&gt;
      &lt;li&gt;something&lt;/li&gt;
      &lt;li&gt;something&lt;/li&gt;
      &lt;li&gt;something&lt;/li&gt;
      &lt;li class="last"&gt;something&lt;/li&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p>Now I know if I want to select the last child I can do that by using either "ul li.last" or "ul.li:last" but say if I wanted the second from last, or third, or 20th? Now would I do that?</p>