Calendar contest

We need a bridge between Phoca Gallery and Paypal. We are going to have a gallery of images, and below the image there is going to be a "Vote" button. This button needs to send the user to paypal where the user will pay $1 to vote on a picture. They should be able to update their "Quantity" to vote as many times as they choose. So if they click the button and it takes them to Paypal, it will show a $1 item in their cart (the item number should reflect the name of the picture they voted for), and they can update the qunatity of their cart to 5. This would be counted as 5 "votes" and would cost the user $5.