Add Google Checkout Cart To Site

We want to have Google Checkout added to our existing site [login to view URL] as another way of shopping on our site. Right now we have PayPal Standard Shopping Cart Only. Please look at the site and let us know. We do not want just a Google Checkout Buy it now with no way of adding items (if you understand Google Checkout , you will know what we are asking for) The same way we have Paypal as a free shopping cart and pay system is the same way we want Google Checkout. With Papyal we control shipping options and taxes. We need these options as well. Google's Checkout carts have these options FREE. Please advise. I see Google has two ways of installing it and it should be VERY simple for the right person. We only have a total of 2 pages that have 2 products each for a total of only 4 products. Rocco