title: IE JS-error when closing a Fancybox-iframe containing a YouTube movie
body: <p>The following error can even be found the FancyApps page itself. Go to <a href="http://fancyapps.com/fancybox/" rel="nofollow">http://fancyapps.com/fancybox/</a> in Internet Explorer 9 for example. Go to Internet Options > Advanced > Disable script debugging (Internet Explorer). Click on the YouTube (iframe)-link and close the movie. You'll see the following error appear onscreen:</p>
  
  <p>Line: 1
  Error: '_<em>flash</em>_removeCallback' is undefined</p>
  
  <p>Any idea on how this error can be avoided? Thanks in advance!</p>