Expanding tree structure

I have this site bookmarked and I know I got the link from the forums here but now can’t find it.

http://www.pem.org/yinyutang/

If you click on (bear with me here) “Explore House” and then in the upper right corner of the popup window click on “Family Genealogy” and then “Start Family Tree”.

My question is: How hard would it be to recreate this? I need to build an organizational chart for my group’s intranet page and instead of having a huge boring scrollable graphic I thought it would be nice to have something like this that expands on rollover and then when a name in the org chart is clicked more info comes up (e.g. office location in the building, contact info, etc.).

I don’t necessarily need the timeline at the bottom - just the expanding tree structure.

Can anyone push me in the right direction?

:hr: