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Ok, I've come up with a really good start on this one. Here's the code for the PayPal button:
echo "";
The Ad Title, Ad Price, and the e-mail Account of the Ad Poster dynamically updates based on which ad your visitors are viewing. So your Advertisers MUST use their PayPal when posting an Ad.
Ok, here's the down side. 1) I'm having a heck of time getting it to position correctly. 2) Only the first word of the Ad Title is sent to Paypal. 3) Only USD is currently supported.
This little hack is actually going to be quite useful for me as well, so I'm going to keep working on this as often I can.
I'll keep you updated.