title: jQuery not updating div
body: <p>I have an element like this:</p>
  
  <pre><code>&lt;div id="foo_&lt;?php echo $id;?&gt;" class="hidden"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>I'm trying</p>
  
  <pre><code>if ($("#foo_ " + id).is(':hidden'))
  {
      //stuff
      $("#foo_ " + id).html(html).slideDown('fast');
  }
  </code></pre>
  
  <p>I've checked repeatedly, the div <code>foo_233</code> is being found in firebug and is being shown as hidden. The id is passed on to the javascript function correctly. But still the above lines aren't working. What could be wrong? Its very frustrating..</p>