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This would obviously require some client-side code, such as a Java applet.
Is there any such product available for Zope? I've looked on the web site, and the closest I've found is SmartSections, which really doesn't do what I need.
Try here: http://www.bris.ac.uk/ISC/cms/ttw.html It's a pretty long list, but most get knocked off due to being IE-only, expensive or buggy. I haven't yet found a good cross-browser tool.
If not, I'll probably write something myself using a Java applet.
Oooh oooh, I'd love for you to do that... and release it to the rest of us :-). Check out this project (also on Paul's page above) as a possible starting point: http://sourceforge.net/projects/htmltea/ . It doesn't appear to have been touched in almost a year though, so I guess the original authors have given up on it :-(. hth tim