69392 Keeping Track of Popunders Ct.

Hello Programmers, I need a script or simple program to keep track of popunders shown. I am "buying" popunder traffic from a person who has many hits to their site. Hit their site and my site popups under theirs. Here is my question/problem... how do I know how many times my site was shown? Here is the code in their page, is there a way I can keep track of how many times their site was hit, and my page was shown? (Please see attachment) Thank you, Bob Westbury This needs to be very low budget as there is very little money involved.