I am looking for a programmer for the following work. I need to somone to add a textbox in my shopping cart where a customer who has a voucher code can add that voucher code. Once they add the voucher code a percentrage would taken off the final price. The backend of the site which is the admin section will have the option of having 5 different types of vouchercodes that will give percentages to each vouchercode.. Please bear in mind this is a customised shopping cart. Please give me price aswell if intrested in the job. I need this doing quickly so only serious programmers who can do the job message me.