According to the ibill documentation snippet posted about 70 posts or so back, it looks like you could set up the following scenario:-
[On a gallery page]
Have a link to "Gallery 2" that goes to
http://www.gallerysite.com/gallery2.html
gallery2.html is a 0 second meta-refresh redirect page that sends the surfer through an ibill-formatted link where the landing page is
http://www.gallerysite.com/gallery2b.html
The surfer then sees the pictures at gallery2b.html and their browser contains a cookie for whatever sponsor program you just piped them via.
Make a visitor view 10 galleries, and you've just sent them on their way with 10 cookies that will live for the next 24 hours...
At least, the above is what I understood *could* be possible from ibill's own documentation!
But I could be wrong (I'm sure you'll tell me in a heartbeat!)