title: jqueryui dialog to gray out screen
body: <p>I'm using the jQueryUI (extension?) and have a simple overlay on a page. <a href="http://jsfiddle.net/vhA2w/" rel="noreferrer"><strong>Here's what I have so far</strong></a></p>
  
  <p>Anyway is there any built in way to grey out the screen when the dialog is open? I know you can do this by appending another div to the page, I want to know if jQueryUI has something like this built in.</p>
  
  <p>I couldn't find anything like this on the API, maybe I missed something.</p>