Going to Paypal from Product page

http://www.live4hope.org/index.php?m...&products_id=1

Here is a product page that I want to add a paypal button for donations and I want contributors to go straight to Paypal to enter in their donations. As things are set up now in Zen, if I put a Paypal button even in the product description, it sends you to the shopping cart page, with nothing in the cart. I want to bypass the cart page altogether and go to PP. Is there a line of code in the header I need to take out? Please help :) Thanks! Amy