You can ajaxify you viz by implementing the "request" controller
method with an ajax call.
That method is triggered when a node is clicked and the viz needs to
load more data (to show its children for example).
Here's an example that makes use of the request method:
http://thejit.org/Jit/Examples/Spacetree/example2.html
The code is here, take a look at the request method implementation,
you should replace the existing code for an ajax call there:
http://thejit.org/Jit/Examples/Spacetree/example2.code.html
Hope it helps,
--
I would never die for my beliefs because I might be wrong.
Bertrand Russell