i need some hints how i can implement a form validation for two or more checkboxes within review view in checkout process. For german ecommerce its needed to accept terms and conditions and a so called right of withdrawal. This should be done before order is placed. I added two new checkboxes in review.phtml.
For the payment step theres a js script which creates a form object:
var payment = new Payment('co-payment-form', 'http://stellalena.intra.m-zentrale.de/checkout/onepage/savePayment/');
How could i realize a form check for my review step? Any hints?