Yes! I ran into exactly this problem doing the back end of a site for someone who was hosted on WorldCom, or WebCom.... it was a few years ago and I don't remember exactly who it was but I do remember that they did not allow any server side scripting whatsoever. Everything had to be done on the client side. You can build a functional cart using only JavaScript and a hidden frame. You just need to use forms in the main frame to alter the contents of a form in the hidden frame. Then, when the shopper is ready to "check out", the "check out" button is used to submit the form in the hidden frame back to the main frame. It's certainly not the most efficient way to accomplish the task, but it does work.
