Fixed and shrinked Header: Placement problems with logo and menu

Hi,
via default the main menue in the header sits exaktly in front of the logo which obviously destroys the design.
If I place the menu via css out of the way, the marks for actives links are completely wrong (fixed and shrinking activated!).
How can I fix this without endless css-hacks?
You can see the problem here:

Thanks in advance
Tim