Jquery - How list id elements contained from a div
<p>If I have a div like this:</p>

<pre><code>&lt;div id="box"&gt;
  &lt;div class="but" id="1"&gt;Text 1&lt;/div&gt;
  &lt;div class="but" id="2"&gt;Text 2&lt;/div&gt;
&lt;/div&gt;
</code></pre>

<p>How can I create an array of all IDs of the <code>.but</code> elements contained in  the <code>#box</code> div?</p>

<p>In the example will be <code>[1, 2]</code>.</p>
