Change element style after .get() success
<p>I'm new to JS. I'm trying to change button's background-color after .get() success.</p>

<p>Here is example: <a href="http://jsfiddle.net/csTpG/95/" rel="nofollow">http://jsfiddle.net/csTpG/95/</a></p>

<p>What's wrong with my code?</p>

<hr>

<pre><code>$('.add').click(function() {
    var productID = $(this).attr('name');
    $.get('/',{item_id : productID}, function() {
        $(this).addClass('clicked');
    });
    return false;
});
</code></pre>

<hr>

<pre><code>&lt;button class="add"&gt;click me&lt;/button&gt;
</code></pre>
