Navigation menu with pulldown submenus using dhtml

Navigation component displaying a horizontal menu with menu items activate a link or open a (dhtml rendered) pulldown menu containing additional menu items. Each of these submenu items again activate a link or even expand to another pulldown menu.

Menu items are page context relative and can be based on other pages, folders, external links and/or document sets.

The Menu decoration will probably be implemented as special decorator, but maybe also as portlet.
The MyFaces JSCookMenu component looks interesting for this purpose.