Export our design to an oscommerce checkout

1) Export png file to an oscommerce checkout. 2) It will feature a 3 (maybe 4) step process. a) First page is entering information into fields, and entering customer information into fields. b) Page two will be reviewing the customer information, and billing information. WE NEED TO MAKE IT POSSIBLE SO THE CUSTOMER CAN CLICK THE BACK BUTTON WITHOUT LOSING DATA IN THE PREVIOUS PAGE. c) Page three will be the thank you page. 3) We want to receive all information via email, we don't want customer information or anything being stored in a database. Customer needs to receive receipt, and we need to receive customer order information all via email. THIS MAY BE A 4 STEP PROCESS IF WE DECIDE TO MAKE ENTERING CUSTOMER BILLING INFORMATION ON ONE PAGE. We actually already have this in place, so most of the work will just be copy and paste. Thanks!