TRY THIS...
1:) Create a new button file in /buttons called
continue_shopping.tpl that contains the following code:
Code:
{include file="buttons/button.tpl" button_title=$lng.lbl_continue_shop}
2:) In Admin go to "languages" edit languages and create a new
entry called "lbl_continue_shop" (without the quotes)
Now in cart.tpl or where ever you want the button to appear just add this
code:
DONE!