First this must be original. No reusing code from dynamic drive or the similar sites.
What I need is a popup to appear when someone clicks a paypal purchase button on products. The popup would offer a second item at a discounted price to the buyer.
For example, the popup could read:
"You can purchase Volume II for an additional $20. If ordered separately the cost is $49."
Yes, include the upgrade to my purchase | No Thanks!
The popup must be dhtml and blocker proof. Must be VERY easy to integrate, the less supporting files the better, customizable for different items and discounts, and accommodate an image and text.
No database interaction required.