Vertical navigation menu - open third level on click

[kzub]

Can you, please, help me with ideas how to make a vertical navigation menu with first 2 levels always opened and the third (eventually fourth, fifth ... level) opened below only when its parent is clicked.
Thank you.

[manuel]

Here's a good starting point if you want to work with accordion menu's:
http://forum.cmsmadesimple.org/viewtopic.php?t=48733

Greetings,
Manuel