Adding classes to LI with JQuery LI to every 7th item
<p>I am using this code to add a class to every 7th LI items and the first one too:</p>

<pre><code>$('ul li:first, ul li:nth-child(7n)').addClass("first"); 
$('ul li:first, ul li:nth-child(1)').addClass("first"); 
</code></pre>

<p>My problem is that it just adds the class to the 1st and the 7th item but if I add another 7 or more it doesn't add it.</p>

<p>I need to add the class the every 7th li item.</p>
