Expandable/Collapsible Page Tree Navigation?

I’m looking for a plugin that will allow me to have an expandable/collapsible page tree navigation. I have about 200 pages that have about 10 page parents. Is there any kind of plugin that will allow me to do this? Or other technique? I’m trying to use WordPress to replace the standard help file. Most help files have a little plus sign that expands the content in that section.

Thanks,

Tom