Example (hopes it makes sense):
1. I move the mouse over 'Diverse' ín the main menu in the top frame.
2. I scroll down into the submenu in the buttom frame and chose 'Links'
3. I once again move the mouse into the main menu in the top frame (WITHOUT crossing over 'Diverse') and chose another item (eg. 'Familie').
The mouseover effect does NOT disappear over 'Diverse' and two menu items now have the crossover effect (Dark Grey)

I can repeat this and get the mouseover effect to stay over the entire main menu.
Can anyone tell me how to fix this, I have tried everything I could think of, but nothing works.
Please help