[markwhoo]

If you really want to make a change to allow customers to see plain invoice while keeping your highlighted values over one, just tweak your code to this:

<td align="center">
{if $usertype eq "P" or $usertype eq "A"}
{if $product.amount eq 1}
{$product.amount}
{else}
<FONT style="BACKGROUND-COLOR: yellow">&nbsp {$product.amount} &nbsp</FONT>
{/if}
{else}
{$product.amount}{/if}
</td>

Just food for thought if interested...