[balinor]

It isn't that simple I'm afraid. The way the button template works, it is a three cell table, with an image on each end and the 'text' in the middle with a background image so that it auto-stretches to the size of the text. If you change that to an image, you will have the same button everywhere. There are a few ways of changing buttons:

1. Create a different button template for each button.

2. Hard code the image into each individual template (checkout, cart, product, etc).

3. Edit the three existing button images to fit the look you want.

There are quite a few posts on this in the template editing forum, have a look.