title: jQuery current element index if has class
body: <p>so my code generates like this (when click a it adds active class to current):</p>
  
  <pre><code>&lt;div&gt;
  
  &lt;a href="#"&gt;&lt;/a&gt;
  &lt;a href="#"&gt;&lt;/a&gt;
  &lt;a href="#" class="active"&gt;&lt;/a&gt;
  &lt;a href="#"&gt;&lt;/a&gt;
  
  ... 
  
  &lt;/div&gt;
  </code></pre>
  
  <p>how can I grab active a tags index?</p>