Need a small modification to a script

Hello. I'm trying to add a modification to a script bought at [login to view URL] . Its a classified script that works kind of like ebay, but without the auction. You can download the script for free at the site or here: [login to view URL] Im trying to make it where everytime a buyer buys an item he will be charged a 5 dollar fee through paypal sent to the service provider (me)... and thats it! ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Windows XP", "in all 3.0+ versions of Internet Explorer and Netscape", "Linux"