many thanks for your reply! But this was not the behavior i expected. 😉
The client (in contrast to me) wants it like that: A dropdown or collapsible menu which expands when clicking and/or hovering. When the menu entry is selected (or clicking somewhere else) the menu tree is closing. After the page is loaded and he hovers again the menu, he wants the menu expanded to the active page. Something like at @YellowPhoenix site, but only expanding the menu on hover to the active page.