I've had really good luck with the hyperlink builder for portions of my database. I've created over 50 links with fields, but I'm totally stumped on this one.

http://www.peekyou.com/usa/texas/john_doe
What is confusing to me is the "john_doe"
I'm confused with paths instead of parameters.

I am trying to get:
http://www.peekyou.com/usa/texas/[FIRSTNAME]_[LASTNAME]