title: How to preview an ad using the preview_url in the creative_spec?
body: <p>I'm developing a Facebook connect site that manage Facebook Ad Campaigns and I have a small
  problem.
  When I'm creating an Ad using the API I receive the preview_url in the creative_specs of the ad created and then I want to show it in my website.
  However, the URL i get is inside Facebook. example: 
  <a href="http://www.facebook.com/ads/api/creative_preview.php?cid=6003167825281" rel="nofollow">http://www.facebook.com/ads/api/creative_preview.php?cid=6003167825281</a></p>
  
  <p>I can't show it in an iframe because of facebook frame detect code, and i can't request to it in an AJAX call (i keep geting Bad Request 4xx)... 
  So how on earth I can preview an ad I created using the Facebook ads api in my site??</p>
  
  <p>thanks,
  Yaniv</p>