title: jQuery BlockUI Plugin - How to set a callback function when I need to unlock the BlockUI
body: <p>I am working on the jQuery BlockUI Plugin and I like to adopt the style illustrated for iPhoto (ish) <a href="http://malsup.com/jquery/block/#demos" rel="nofollow noreferrer">http://malsup.com/jquery/block/#demos</a>.</p>
  
  <p>I have designed the jQuery Form that will be submitted through aJax.
  Here is what I would like to do:</p>
  
  <p>1> After the user clicks the submit button to fire up the form to server, I pop-up such a iPhoto (ish) dialog</p>
  
  <p>2> When the aJax response event returns, then I unlock this dialog.</p>
  
  <p>What should I do to achieve such a feature?</p>
  
  <p>Thank you</p>