That was his 60th birthday, and he's 65 now, so maybe they just decided it was time to take it down. Of course the photo had become famous for the wrong reasons, and that may have been a contributing factor. Here's the original for safe keeping. Click for full size.
And El Naschie's photoshop:
The Internet never forgets.
't Hooft's birthday is July 5. Does anyone know whether he had a 65th birthday party last year? If he did, El Naschie probably was not invited.