try this for the prnotice file;
Code:
{*
$Id: prnotice.tpl,v 1.1 2010/05/21 08:32:18 joy Exp $
vim: set ts=2 sw=2 sts=2 et:
*}
{*** NOTE: If you are reselling X-Cart stores, please contact us (http://www.x-cart.com) before changing the Powered-by note here. ***}
{if $main eq "catalog" and $current_category.category eq ""}
Powered by X-Cart <a href="http://www.x-cart.com">{$sm_prnotice_txt}</a>
{else}
Powered by X-Cart {$sm_prnotice_txt}
{/if}