My website: www.lavashark.com

As you can see we do web design.
If you look at www.lavashark.com/affiliate you will see that we give a
20% commission to anyone that brings in a sale.

There are plenty of free systems out there that will do what we need it to.
We need to find a system that will give the affiliate a link that they
can either give out or place on there websites. If a sale comes in we
can check to see if it originated from a link. If it did we would be
able to give the affiliate a 20% cut.

Please ask any questions you may have before you answer.

Sincerely,
Will Stein
Mansei! Design
www.lavashark.com

The system would have to assign a unique refferal code to every
affiliate and include it in the url that you give out. When some one
clicked on the affiliates url, taking them to your site, your web
server would need to be able to recognize that code, and translate it
into a cookie, and store it on the customer's computer, or encode it
into every single link on your website, so at no time could the
affiliate's refferal could be forgotten. Then when it came time for
the customer to sign up, you would have the affiliate's code submitted
along with the other sign-up info. You would need some sort of
database on the back end to keep track of all this. This freeware
script provides a good framework in PHP/MySQL:
http://www.webradev.com/postaffiliate/index.php. I would just borrow
parts from that script rather than try to customize it completely.