title: jquery Accordion -- collapsible bug
body: <p>in jQuery  <a href="http://docs.jquery.com/UI/Accordion" rel="nofollow">accordion</a>, we could set collapsible parameter as follow</p>
  
  <p>$("#accordion").accordion({ active: 0 , collapsible: true});</p>
  
  <p>The collapsible behaviour is working fine for the first time.
  But subsequently it would give error and stop the whole accordion behaviour.
  "this.toHide.parent()[0] is undefined"</p>
  
  <p>Any idea whether this is known bug for this?</p>