Hi,

I use Lightbox 2 (http://www.huddletogether.com/projects/lightbox2/) on my page, and I have a gallery with animations (animated gif`s). It works great in most browsers (IE, Firefix, Safari..) but not in Opera. In Opera the image is just loading, but it never finish...

"Normal" pictures works great in all browsers..

Does anybody know how to solve this problem?

Try Thickbox. I was having the same problem you did and Thickbox works great:
http://jquery.com/demo/thickbox/