That code is incorrect, it should be:
Code:
<font class="ProductPrice">{* {$lng.lbl_our_price}: *}{include file="currency.tpl" value=$products[product].taxed_price}</font><br /><font class="MarketPrice">{include file="customer/main/alter_currency_value.tpl" alter_currency_value=$products[product].taxed_price}</font>{if $discount gt 0}{if $config.General.alter_currency_symbol ne ""},{/if} {$lng.lbl_save_price} {$discount}%{/if}