small oscommerce mods

1. I offer free shipping after a certain total amount, but because of coupons applied the total sometimes goes below the required amount but the free shipping still gets applied. I think it's just a matter of rearranging the order totals to fix this. 2. I'd like to change how the totals are arranged on the cart and admin pages. Should be like the following: sub-total discount shipping invoice total Only oscommerce experience will be considered. I know this is not much so budget is $30 and needs to be completed immediately upon selection.