a cookie has a maximum size of 4 KB, if you store the cart contents in a cookie it is possible to exceed the 4 KB maximum cookie size.
Instead, you should set the cart to use sessions.
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.