title: In Jquery Chosen plugin remove selection if user selects a particular value
body: <p>I have the following multi select and I am using <a href="http://harvesthq.github.com/chosen/" rel="nofollow">Jquery Chosen</a> plugin     </p>
  
  <pre><code>  &lt;select multiple="multiple" class="chzn-select span3" name="requestCategory"   id="requestCategory"&gt;
          &lt;option selected="selected" value=""&gt;All&lt;/option&gt;
          &lt;option value="2"&gt;Electrical&lt;/option&gt;
         &lt;option value="4"&gt;Emails&lt;/option&gt;
         &lt;option value="3"&gt;Filming Permits&lt;/option&gt;
         &lt;option value="10"&gt;test1&lt;/option&gt;
      &lt;/select&gt;
  </code></pre>
  
  <p>Client wants to make sure that i do not allow user to select ALL if any other value is selected or if user selects any other value then automatically deselect/remove ALL; because ALL = all categories so having individual option does not make sense. How do i do this?</p>