[Zope] Disabling buttons

I'm taking over an app that uses a bunch of client side Java. The only reason I can see it uses Java is because it allows you to build logic like "if this radio button is selected, this checkbox is disabled." If there was a way to do this in a combination of DTML and Javascript then the app could use just those technologies. Has anyone got a demo of something like that? I can think of fairly convoluted ways to do it -- is there a straightforward way? Paul Prescod