Simplify the code a little

It looks to be a bit easier to make jQuery think right if we treat the
functions as values.
Made comment deletion mean *something*

Haven't decided yet how "deleted" deleted should be.  Decided to take a
conservative approach to start, a la LJ, and just hide the content.
Slightly better than before, though: we now block at the server, instead
of simply concealing it at the client.