To deal with some of the more advanced features of FBML, Facebook has three API methods to help you. The facebook.fbml.refreshImgSrc method fetches and caches an image at a given URL. To refresh content from a given URL, you use the facebook.fbml.refreshRefUrl method. Lastly, to use content as a handle in FBML, you can call the facebook.fbml.setRefHandles method.
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