Hiding the third navigation level - without losing active item in menu hierachie and breadcrump

Hi there,

I like to create a website with a navigation which is two levels deep.
I have a third level which should not be displayed in the menu.

The user should not see the nodes from the third level in menu, he can only access through the content area.
Nevertheless the menue item from the second level (where the nodes of the third level are in menu modul assigned) should be marked as the active item within the menu. I'm looking for a solution of that problem...

Here is a link to my website:
http://s152854779.online.de/cms/produkte/kundenzufriedenheit

First menu level: "Produkte"
Second menu level: "Kundenzufriedenheit"
Third menue level: "Kundenzufriedenheitszyklus" (only accessable through the content area, should not be displayed in menu)

But the second menu "Kundenzufriedenheit" should still stay active (red).

I hope I explained that issue understandable.

I'm would be very happy about hints or ideas...

Many thanks, Andreas