PHP/CSS Shopping Cart Broswer Issues

We have a php (shopscript) shopping cart that does not have check-out displaying properly in FireFox 4 or Google Chrome (please also check other browsers). It works fine in FireFox 3 and IE8. It displays all fields but then cuts off the bottom of the template so there is no footer and no submit buttons on multiple pages. Your job is to fix this without affecting the rest of the site. PMB for link, budget is $30.