[funkydunk]

Did this but slightly differently to you:

first created a new button template: showdetail.tpl in skin1/buttons/

[img]{$ImagesDir}/details.gif[/img]

then in customer/main/products.tpl

have an include such as:

<a href=product.php?productid={$products[product].productid}&cat={$cat}&page={$navigation_page}>{in clude
file="buttons/showdetail.tpl"}</a>

hth