Update: Okay, I've gotten a couple of off-line comments complaining about the LACK of comments in this code. It's really simple, I swear.
The nice thing aboutn this code is that you only have to tweak two lines. The first line is a list of keywords to search for to do the re-direct. To change or add sites, you just create a comma delimited list, thusly:
The nice thing about that approach is that you can add as many sites/keywords as you want.
The second line is simply an URL you'd like to send this badboy to. The way I do it is cool, as the person redirected can NOT simply hit the back button in the browser to avoid dealing. In fact, the only way they can get to the site at all is if they snag the URL and paste it manually.