jQuery BlockUI and sroll

HTML

<script src="http://malsup.github.com/jquery.blockUI.js"></script>
<div id=non-blocked>Non blocked contente</div>
<div id=blocked>
  <p><a href="javascript:alert('clicked')">Click meeee</a></p>
</div>

CSS

p {margin-top: 500px;}
#blocked{ overflow: auto; position: relative; height: 400px}

JavaScript

$('#blocked').block()