Cleanup and bugfixing for the navigation bar, so that some of the more impressive failure cases (like clicking on the navbar making the navbar evaporate or blow up like a puff adder) don't happen.
Cleanup and bugfixing for the navigation bar, so that some of the
more impressive failure cases (like clicking on the navbar making
the navbar evaporate or blow up like a puff adder) don't happen.

bk: 3a03d735f35pj-2hb-kSsp7Bx5TDDw
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper