add "ADD TO CART" button outside, under thumbnail

Hi,
Please help, I am using the opencart v1.4
I want to add the button ADD TO CART right under the thumbnail of the picture.
I tried to search the forum but didn't have any luck.
The purpose of the Button is for the customer to ADD TO CART while browsing the list, without actually click on to see the detail of the product to add to cart.
Please help, Thank You very much