Help me Im confused!

[mangogirl]

Hi all. I hope someone can help me I am making a clickcash site and Im trying to put my sponsors join page (the sign up form) in an iframe on my site and I'm looking for a way make it blend in better to my site and look less "ifriends". I have seen other sites that do this but I don't know how. Here is an example of what I mean. https://secure.abrava.com/amylockheart/ssl.php

That looks like her own join page but if you tried to sign up you would see that its actually this form in disguise. https://orders.webpower.com/iFriends/vpNA.htm

(or look in the source code at the iframe source url and you will see what I mean)

So I was wondering how was this done and can anyone steer me in the right direction?

Thanks,
Mangogirl