I need an on the fly price calculator for the Prestashop shopping cart. The store is a custom made frame company that requires the user to input the height and width of the frame that they would like in text and the calculator works out the price on the fly. Other attributes will be added to the product which will also need to be added up. AJAX would be the preferred method. If you take a look at [url removed, login to view] and [url removed, login to view] [url removed, login to view] see their system you will see what I need.