The main problem is: full-qualified page names in navigation bar.
Wiki navigation bar before patch:
http://sadko.xskernel.org/wp-content/uploads/2009/09/wiki-before-patch.jpg
I've corrected code (see patch in attachement)
After applied changes wiki navigation bar looks like:
http://sadko.xskernel.org/wp-content/uploads/2009/09/wiki-after-patch.jpg
Thanks