Ajax + PHP Cart Module

We have required Ajax Shopping Cart Section only. Please visit [login to view URL] We have develop our own custom shop for pizza but we want to develop cart section as like above URL. Let me explain. On this cart page there are many pizzas with different sizes (small, medium, large, extra large, etc). As you click on any size of pizza its will show you light box windows. Where main pizza display in cart and all extras for pizza display in list on light box. Here you can add multiple extra's and delete. As you final, you final cart float to cart and shopping cart section display record. Same again. if you want to edit existing cart its allow you to edit and again light box windows appear with all extra's and shopping cart. Here you again final cart and finish. I think you understand better if you are Ajax and PHP developer. We need this section only, so, before any quotation, please remember we have reqired only cart section not full shopping cart or any thing. We will prefer if some one show us demo.