make currUnit common to app.start(), and just have the hashchange function update it. this makes it accessible to other jquery event binds, which we will need to be able to step through a unit with buttons and other widgets
make currUnit common to app.start(), and just have the hashchange function update it. this makes it accessible to other jquery event binds, which we will need to be able to step through a unit with buttons and other widgets

fred6/eucele