add class current when slidetoggle
<p>i try to create simple accordion menu with simple code.</p>

<p>Here is my <a href="http://jsfiddle.net/aCaEG/" rel="nofollow">Jsfiddle</a></p>

<pre><code>$('li').click(function(ev) {
    $(this).find('&gt;ul').slideToggle();
    ev.stopPropagation();
});
</code></pre>

<p>my problem is how to add class <code>current</code> to parent li when slidedown, something like below:</p>

<pre><code>&lt;ul&gt;
    &lt;li class="current"&gt;
        level 2
</code></pre>

<p>and remove class <code>current</code> when slide is closed.</p>
