ad click through redirection w/ logging
 

where can I get one from, an ad click through redirection that is capable of logging visitors.

example:
before: www.myaffiliate.com/blahid=4643

and after it'll be something like this:
http://www.mydomain.com/cgi-bin/log....om/blahid=4643 or something close

just want to log where my visitors are going

any help will be greatly appreciated
Thank you