It's not impossible, but it's risky. MtGox stopped doing business with pp back in 2010... Paypal themselves is very belligerent against bitcoin, as these guys found out:Can anyone recommend a good xfer service for PayPal -> BTC Bitcoins ?
Send PP -> get BTC
http://coinpal.ndrix.com
If you absolutely have to use PP, skim through this page to find one that accept them:
Bitcoin Currency exchanges Archives - Bitcoiney Bitcoin Directory
..But expect to lose up to 20% of your value in fees to paypal.