Script custom paypal subscription button

Need to create custom paypal subscription buttons. -Purchaser has option to enter promo code to get discount on first payment only -Future automatic payments are charged non discounted price -Need to be able to track promo code orders (through paypal or separately using another method) -Should be delivered in html or java script code that can be added to our website. (see order page at [login to view URL] Please keep in mind that these are recurring subscriptions, not buy now buttons. Thank you