Jquery Change background color of DIV to #333 only when all checkbox is not checked
<p>I have 5 <code>div</code> with <code>class .thumb-folder</code> and inside each contains a <code>checkbox</code>.
I also have another <code>div</code> with a class <code>.alarm</code>.</p>

<p>When 1 or many <code>checkboxes</code> is checked the <code>div</code> with <code>.alarm class</code> changes background to red.</p>

<p>How to change the <code>div</code> with the <code>.alarm class</code> to <code>background #333</code> only when no <code>checkboxes</code> are checked?</p>

<p>Here is <a href="http://jsfiddle.net/bhykT/" rel="nofollow">a link</a> to jsfiddle of my current code.</p>
