title: jquery find disabled in select box
body: <p>I have three select boxes:</p>
  
  <pre><code>&lt;select id="box1"&gt;   
      &lt;option&gt;foo1&lt;/option&gt;   
  &lt;/select&gt;               
  
  &lt;select id="box2"&gt;
      &lt;option&gt;foo2&lt;/option&gt;
  &lt;/select&gt;
  
  &lt;select id="box3"&gt;
      &lt;option disabled&gt;foo3&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>I need to get select id of option:disabled -> (box3)</p>
  
  <p>How to find id of option:disabled with jquery?</p>