[Zope] frame in zope

I have been looking through egroups for answers to people problem, but haven't found any to work for me. Soory to bug everyone. Ok here is my problem. I am developing a zope application for our company that has frames in it. Three to be exact; top, right and left. Top never changes, right contains a list returned from a database, and the left need to be updated by click on a href in the right frame, with some data from the right. How is the best way to perform this operation, can I tell a frame to reload a page with a python return statement? Or is it best to use some cookie or varible. Thanks for any help.