reivew cart button

on my product page I have removed the sideboxes to make an uncluttered product dominated page.
www...stitchnframeonline...cam/snfcart

Working pretty good so far but I see I do not have a Review Cart button - even tho the add to your cart button will take a customer to the same place. It is not terribly clear.

So I can either add another button above the add to cart button up top OR I can change the top button to a view cart button. Since the bottom button is also an add button

I know by starting this by myself I will be taking off more than I can chew -
So this is what I have done-

I have the green button mod
so I constructed a new botton called
button_review_cart.gif

At this point the only thing I know is that I will have to define the button and image in two places in
includes/language/english/button_names.php

two Q?
may I assume this will need to be in an override button_names.php

and what other mods are needed?