javascript total and 3 for 2

Hi, I am creating a contact/order form using JavaScript for validation and to calculate a total, I have all of the validation done but I need a coder to finish off the total order. The order form consists of 8-10 products that to add the product to the order the user needs to select the corresponding checkbox. I have worked out how to generate a total amount but I need some one to finish off the 3 products for the price of 2 (lowest item free. I would like to display, Sub total, (all three products) Discount product, (Lowest item free) Total, (products- lowest item free) Regards If anyone is interested I will send them the link to what I have already done, thanks ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform IE, FF