I'm currently developing a website where users will be able to upload content. I would like to be able to show a full-page ad whenever someone tries to view the content. The ad should take up most of the screen, and I should be able to have a "continue to the content -->" link at the top. Preferably, I want something like what is currently on Forbes (if you haven't seen it, here: http://www.forbes.com/fdc/welcome.shtml but with an ad in the black area). Of course, the most revenue is the best.

Thanks.