need a reliable click tracking script
 

I'm looking for something to route my sponsor links through so it will put the links in a format such as http://www.mysite.com/tr/site.php?fid=milfhunter

I have been using Fast Click but I don't think it was intended for volume useage because it keeps getting slower and slower and the DB is generating weird errors.

Any recommendations?

try www.openads.org

It is not the easiest script to use but it really has tons of features. it will also show you the click throug ratio on your links / banners