How to make relevent ads?

[Bouncer222]

I created this simple html page. separate from my vbulletin site.
http://www.brotherhoodofgamers.com/tf2motd.html

Now, if you highlight the page you'll notice in small font between the advertisement and the picture it says:

games computer console teamfortress 2 clan ventrilo game server

I put that in there, hoping that the ad would show relevent ads to those words. But apparently its displaying the same 3 ads over and over.

How would I go about making the ad display relevent content to words?

Thanks.