Unfortunately we can't have any javascript in *.inc files, because
the browser will strip them for security reasons. I moved all the
attribute callbacks etc. to the only logical place: user.js.
It's fine for now, but user.js is going to need some serious cleaning
up in the future.
Hide the search bar when showing the groups listed for a user, and resotre it when doing other searches.
The enroll button is added only on the groups page, and removed along with anything else in the searchButtons div when a new search is started.