103175 Google Checkout Quick Script

I need some script that works with Google Checkout which permits me to collect and/or pass an email to a thank you page of my choosing. I am looking for someone who may have a script like this or is very familiar with what I am trying to do. Basically I have a buy now button now.. however, after the purchase I want it to post an email address to my thank you page. Do you have a script that can do this? Jay