Closing navigation

I am quite sure this can be done.  After I select a menu item, how can I automatically get the menu tree to close?

Bill,
Can you give a little more information? Is your menu setup through a navigation component or some other way? 

Thanks!

Hi Amy… I have some question. When I use Nav Menu and select an menu option the menu itself stays open (expanded). Is there a piece of javascript or such that will collapse it again?