Viral Email Program added to oscommerce website

We would like to add a program to our website that allows people to tell their friends about our website by having a program load in the customers entire address book so they can do so at 1 time with just a click of a button. Our website is [login to view URL] This would be the same type of feature that face book uses when new users sign up. Must be able to work with all types of address books including business address books.