Our Zen Cart version [url removed, login to view]
need "Ajax add to cart" fucntion anywhere with an add-to-cart button
display a small notice message while adding item to cart. ex, "item has been added to the cart"
1. make it a separate module, better no core-file modification
2. need to have no page refresh
3. need to be compatible with IE, Firefox, Safari and Google Chrome
All payment after completion.