Actually, the reason why the pictures aren't showing is because Blogger doesn't allow remote linking to images. I can have similar %20 filenames on my server and it shows up fine, because %20 is just the code for a space character rather than a ? or & for a dynamic URL:
clyderose: Instead of Blogger, maybe you could try an alternative service to host your pictures to post in the forum, like
http://www.tinypic.com/