use oncommand rather onclick here for keyboard access. But interestingly, the timing...

use oncommand rather onclick here for keyboard access.  But interestingly, the timing for DOM updates appears to happen differently between oncommand and onclick, so the element's .checked (and @checked) get updated after the oncommand but before the onclick.  So I threw a negation in front of the .checked test

git-svn-id: svn://svn.open-ils.org/ILS/trunk@12483 dcc99617-32d9-48b4-a31d-7c20da2025e4