agree to terms then confirm

for osCommerce Online Merchant v2.2

I couldn't find a "Must Agree To Terms" module that was really simple to set up so I made this one. There are a few out there but they required changing the database and/or javascript and/or the checkout process. This contribution edits the checkout_confirmation.php page but doesn't change the checkout process at all. It simply takes the user to conditions.php so he/she can read it or redirects them back to the homepage.