Dynamic Menus (expanding)

[stidj]

Does anyone know how to make dynamic PHP menus?

EG.

MenuItem (when clicked it will then display other sub menus)
SubItem
SubItem
SubItem

Then if you click on MenuItem again those subitems should disappear.

Does anyone know a simple way to do this or do most sites use JavaScript?

[sned]

Javascript and CSS is the only way to do something like this, (you can use php to fill in the menu items).

-sned