Javascript store

[aka NatWest]

The details are in the attached images - please help as I am really stuck; I have done the rest of the website but am struggling with this part.
Thanks in advance

[jscheuer1]

This sounds like another one of your homework questions. We don't do homework here, at least we're not supposed to. If you have a live demo or post the code you have, we can point out errors with it and/or suggest ways of dealing with certain things.

However, a javascript store is a ridiculous idea to begin with. In the real world, to get any real functionality and security one must use server side code.