this page is 2 directories up from the site root:
http://www.starfireswords.com/products/leather/1.25x14.php
so the link to the cart file:
<?php
//WA eCart Include
require_once("/WA_eCart/starfire2_PHP.php");
?>
should be:
<?php
//WA eCart Include
require_once("../../WA_eCart/starfire2_PHP.php");
?>