OScommerce/creloaded contribution - sales tax based on delivery address

We need a contribution created (or the below contribution modified), and installed for a creloaded website. Effective July 1, Businesses in Washington State of the U.S. will have to charge sales tax based on where products are being sent too, not where the business is operating from. For details on this new law, look here [login to view URL] We have this contribution to oscommerce already in place and widely used. This should work with CRELOADED, but of course will need any modifications done to do so and work with Washington state cities and counties. [login to view URL] The posted excel file has all the taxes for city and county. This excel file will need to be able to be uploaded as taxes change. Taxes must be tracked for city and county that they are delivered too. Please read and understand the requirements thouroughly prior to posting. Thanks for your time.