Here is my attempt at a web based "explorer" like treeview:

http://waveright.homeip.net/products/FavoritesAnywhere.html

You would have to hack what you needed out of the javascript and its not pretty, but it has DHTML CRUD for the nodes.

I generated the HTML using XML::Writer and then XSLT

I know it dosen't help much in terms of code you can reuse, but it might give you some ideas.

trwww