I think we need a professional guy to make a good mod rewrite, since all the people here including me want a clear root like example.com/category/image.htm vano says he cant, there is a lot of CMS with a similar structure than 4images that can do it. i am not an expert in rewrite URL but am pretty sure it can be done we ll have to wait I supose.
I hope your understanding, my english in not too good