Photobucket doesn't likes direct links to their pictures apparently. I have the same problem with pictures I put up there. When you follow the link you are just directed to the gallery page of it and not the picture directly.
Probably because they want their banners etc seen and make money with it... but you might need to take another image hoster to have the banners shown correctly here
Yeah do what Neria said, use the direct link. Photobucket likes to have the redirect to their page as their standard link you select put since it is a html page not an image file it won't work properly.