Script for PayPal Buy Now button

Hi Let me first say few things about my problem. I am building a website for a Person A who sells DVD (only one title) on his website and as paying option he have only PayPal Buy Now button. Now my client has found Person B that want to sell his DVD on his websites, for commission. Person B will build on theirs website a page for my client’s DVD to sale. As paying option he will use Person A PayPal Buy Now button. That means that when someone buy that DVD on Person B website, money will go to Person A Paypal account and PayPal will send email confirmation of purchase with buyers address to Person A. Person A then have to send DVD to a buyer and pay commission to Person B for that purchase that has been made on Person B website. Problem is that Person B has no idea how many purchases has been made through his website and that’s why he has no idea what his commission is. Person B has believe to Person A. Now Person B would like to receive any kind of purchase confirmation from PayPal each time when purchase is made on his website. But PayPal sends only one email confirmation and that is to account owners email address. I talked with PayPal people and they told me that something like that can ONLY be made by adding custom made script in “Add advanced variables” box of Step3 of Creating payPal payment button process. Create PayPal payment button Step 3: Customize advanced features (optional) Advanced variables (power users) – that is that box I need someone to write me a script that would be implemented in Advanced variables box of Step3 of PayPal Buy Now button creation page. That script would have to make PayPal Buy Now button to send simple email purchase confirmation to Person B email address EACH time when purchase is made on Persons B website. That email confirmation would be second email that PayPal would send. First email is, off course, regular PayPal purchase confirmation that Person A gets as owner of that PayPal account. So, this second email is addition, just for Person B to know when purchase is made. By counting his emails on the end of the month, Person B will know how many purchases is been made through his website and what his commission is. That second email, for Person B don’t have to have all this standard PayPal info but just one simple sentence: “Purchase of DVD is made through your website.” For me is very important that developer who will write this script email me instructions where and how in script I can change Person B email address into Person C and later Person D…or E….F…G email addresses because I know that my client looks around for other people to sell his DVD. That means that in the future I will have to create new PayPal Buy Now button customized for Person C with his email address or for Person D with his email address. Sorry for long post but I was trying to be as precise as I can. For this script I am willing to pay $50 max via PayPal. Thank you!!!