I'm not sure I know what you mean... do you mean that if someone clicks your gotop100.com link code, they are redirected to your other site?
If so, then there's really no way to do that. You could pop your other site as a console when your top 100 loads, but then you might have problems getting people to sign up to your top list because as you know, not many people like pop ups.
I'd recommend putting a banner or link to your other site right at the top of your top 100 list. Once you have built your top list up, it should send you a decent amount of traffic this way.
If that's not what you meant, please explain and I'll do what I can to help you.