2008.12.31 calculator for accessories and tariff addons

These are adjustments to work already done and so are for rmash only. Our website sells mobile phones. We have cashbacks, accessories and tariff addons that we can offer with the phones. We want to offer the customer the opportunity of selecting which accessories, tariff addons or cashback combination they want to buy. The price of the tariff addons or accessories will be deducted from the cashback available for the phone. Thus the customer should have a javascript calculator to enable them to see how much cashback remains once certain accessories or addons are selected. These are adjustments to work already done and so are for rmash only.