Here's an example for building collapsible links. Note that you have to also switch from markdown to full-html to make it work.

Always put the javascript code on the page with the drop-downs.

Copy this code:

Then change Goatweasel to the title of the expandable section.

See also: http://www.sothink.com/product/treemenu/samples/statecode/statecode.php

Nested drop downs?