Tax and subtotal fix

for osCommerce Online Merchant v2.3

see readme for more info, its just a fix for tax and subtotal that doens't work properly. so just copy the includes folder to your root and enjoy o forgot about it. you must activate them through your admin panel. just like other modules searh for: English TAX from the order2 Subtotal of order2 Dutch: 'BTW van de bestelling2 'Subtotaal van de bestelling2