I see what you are talking about, and I'm guessing that it has something to do with the fact that you have so many scripts on the same page. Often times they don't play well together. If you can remember if you installed any of them after this script you might try removing the newer ones and seeing if it starts working again.
But besides all of that, I would highly recommend against using a script for this function anyway. All you need to do is use an animated GIF.
You can find some free software here that will allow you to create an animated GIF:
http://software.benetonfilms.com/Beneton_Movie_GIF.php. If you don't like that Google for "freeware animated gif".
Hope that helps.
John