This project will be for Zen Cart. The script will be written for version 1.2.5 which will be released before this closes hopefully.
Currently the product description page shows a product price I need for this price to update when a attribute is selected. So if the stock item is [url removed, login to view] and you want to select an attribute for a larger size it will for example cost [url removed, login to view] extra dollars so the price would then change on the product description page to 7.00. This way the customer can see the changes right away instead of waiting tell they check out to see the price of the product with all the extras.