Complete cookies based shopping cart

Hi, I currently have a shopping cart that seems to work 70%. I need the following functions added: check the weight of individual items (in database) and add them together to get shipping weight. Check the shipping country Get the correct price for the weight and country Add packaging cost from one database to postage costs set above. If the customer views a B/W image then add B/W to the image name If the customer views a sepia image then add sepia to the image name Allow a specified discount if in certain time period. (from a database)