Yes I have read that but how about the other:
http://domain.com/free/1, http://domain.com/free/2
Would that be ok too?
I think that method would be easier. You can have a dir for all pic, banners etc.:
http://domain.com/free/
and then a subdir for every index.html:
http://domain.com/free/1
http://domain.com/free/2