oh crap man that's a new computer user mistake dohhh!
also, use only credit cards for paypal. that way the credit card company will also investigate and prosecute that person. also ask your bank about doing a charge back. they have to, it's the law.
http://en.wikipedia.org/wiki/Chargeback
A chargeback usually occurs when a consumer files a dispute with their bank or credit/debit card provider. This can happen when a consumer discovers fraudulent or improper transactions on their card statement or online account view. Consumers in the US who use credit cards are afforded chargeback rights under
Federal Reserve Regulation Z, which is made possible by the
Truth in Lending Act. US debit card holders are guaranteed similar rights under
Federal Reserve Regulation E, which is made possible by the
Electronic Funds Transfer Act. Card networks enforce chargeback rights globally through their network rules and regulations.