How to Create an Expanding/Collapsing Tree Menu

You can use text or image within page to control the tree menu to expand or collapse the sub-tree externally. It is magic, isn't it? Let's see how this tree menu works and how to create such a tree menu.

Cick the following link to see in details:
http://www.sothink.com/product/treemenu/samples/statecode/statecode.htm