title: How to select an item in multi group listbox using jquery
body: <p>I can select items in listbox using the following jquery</p>
  
  <pre><code>$('#id option[value=&lt;?php echo $row; ?&gt;]').attr('selected','selected');
  </code></pre>
  
  <p>But it is not working for <code>optgroup</code>, Any idea how to do this?</p>