Can't show the element when its class or id contains dots
<p>I must have class which contains dots, but then jQuery doesn't work. What should I do?
Example: <a href="http://jsfiddle.net/9KYmx/" rel="nofollow">http://jsfiddle.net/9KYmx/</a></p>

<pre><code>&lt;div style="display: none" class="dfv.png"&gt;
    text
&lt;/div&gt;
$(document).ready(function() {
    $('.dfv.png').show();
})
</code></pre>

<p>P.S. ID also doesn't work.</p>
