treeview menu

[Mike]

Here is my scenario. I just took over an existing asp site that is using a
treeview menu on the pages. The treeview is an include file that is an
include that is on every page. The issue is, when the user clicks on a menu
option it opens a new page (menu is still there) and the menu is collapsed.
example:

menu looks something like this

Menu1
Menu2
Menu3

the user clicks on Menu1 they see this
Menu1
NE Region
SE Region
SW Region
Menu2
Menu3

When the user clicks on NE Region it takes them to the NE Region page, then
the menu is collapsed:
Menu1
Menu2
Menu3

Is there a way or an existing treeview menu out there, that will allow me to
keep the selected menu option expanded when the user goes to that page so
when they go to the NE Region page the Menu1 is expanded and NE Region is
highlighted?