Cancel a fancy box close

A quick one since I couldn't actually find this anywhere in the api or documentation. If you want to cancel a user request to close a fancybox then all you have to do is return false from the callback assigned to onCleanup in the fancybox options. Annoyingly I worked this out by looking at the fancybox code but still managed to struggle with it for a while because the callback I inherited had another evaluated function that was causing a close. Oh well - got there in the end!