Custom Thickbox/Greybox Installation

I would like to add the Thickbox/Greybox style ajax function to my ecommerce website, similar to the style used here: [login to view URL] If you click the "Add To Cart" button the product is added to the cart and the cart contents page is displayed in a modal window. That particular website uses Thickbox. For my own website the product needs to be added to the cart along with the selected size/colour option, if available, selected by the customer from the drop-down list (please see attached step-by-step diagram). The project needs to be completed within 1-2 days, certainly by this coming Friday at the latest. Please only bid if you are 100% confident that you are able to complete this project both in function and timescale. Thank you for your interest.