[carpeperdiem]

I only want that change to show up when you viewing products or a product. I do not want this change to show up on the invoices (emails).

so the best way to do this is to ask IF it's a product or catalog. try this:

{if $main eq "product"}
show the currency.tpl edit
{/if}

{if $main eq "catalog"}
show the currency.tpl edit
{/if}

or use an else in there....

Helpful?