The shipping is based on weight and destination. Shouldn't this be based on a session value? Why would the cart be calculating shipping without a destination? Why delete the shipping line from the cart?
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.