no help?
Well I was searching paypal's user agreement and I found this:
No Surcharges. Under Visa, MasterCard, Discover and American Express regulations and the laws of several states, including California, merchants may not charge a fee to the buyer for accepting credit card payments (often called a "surcharge"). You agree that you will not impose a surcharge or any other fee for accepting PayPal as payment. This restriction does not prevent you from imposing a handling fee in connection with the sale of goods or services, as long as the handling fee does not operate as a surcharge (in other words, the handling fee for transactions paid through PayPal may not be higher than the handling fee for transactions paid through other payment methods). Sellers residing in the United Kingdom and listing items for sale on a UK-based website may impose a surcharge, but only under the following conditions:
Both the buyer and seller reside in the United Kingdom;
The purchase price is paid in pounds sterling;
The surcharge imposed by the seller is no greater than is necessary to recover the receiving fees incurred by the seller;
The seller clearly indicates to the buyer prior to the buyer's submission of a bid or (in non-auction transactions) prior to completion of the purchase that a surcharge will be incurred and the amount of the surcharge.
In short, this is not allowed in the US, but ok in UK