The htaccess example that Picplace posted is a good one. What makes it very good is the fact that it uses full URL and not wildcards to shorten the code. I've seen a lot of examples that do use wildcardsin the code and it is easy to bypass the code then.
Here is a little page that I maintain that has additional htaccess info plus some other goodies,
http://www.cleos-porn-links.com/adul...ster-help.html
JanTM
If they load your page in a frame it is still going to have your sponsor codes on it so enjoy, lol.