Thanks all, for the info and thanks Christy for offering to do it for me. I'll try some of the photoshop stuff out and see if I can get it to work, but like Bhamdave said, it might just be that the animation on this particular gif won't work at all. The animation is lightning in a snow globe, so I think it might just be too much movement.

Christy, if I don't have any luck I might kick it over to you.

Thanks again, I'll fiddle with it for a bit.