title: How to center a modal window inside Facebook App?
body: <p>I'm developing a Facebook App using their iframe method.  How do I find my position in the iframe to center a modal window?</p>
  
  <p>Calling $(window.height()) returns the iframe page height and not the parent page.  Using scrollTop() doesn't work because we're not on the same domain.  Any help would be appreciated.</p>
  
  <p>These guys are able to do it somehow, but I can't figure it out...
  <a href="http://apps.facebook.com/mylistfb/?r=true" rel="nofollow">http://apps.facebook.com/mylistfb/?r=true</a></p>