Executing JavaScript from AllegroServe

Say I have a web page that I've served up with AllegroServe (AS), and the
page has a button on it. How do I click on the button and execute
CL code which in turn executes JavaScript code without serving up
a new page?

Here's my real situation:

AS serves up a page with a JavaScript TreeView object in it, with
only the first level built (I don't want to build the whole tree - it's
too big!). When the user clicks to expand one of the folders, I
want to execute CL code which generates JavaScript code to generate the
new nodes. (effectively onmouseclick="foo(folderID)", where
foo() is a CL function, which generates JavaScript like
createNode(folder, node1); createNode(folder, node2); ...).

Bob Clark