def watcher_link(objects, user)
    return '' unless user && user.logged?
    objects = Array.wrap(objects)
    return '' unless objects.any?

    watched = Watcher.any_watched?(objects, user)
    css = [watcher_css(objects), watched ? 'icon icon-fav' : 'icon icon-fav-off'].join(' ')
    text = watched ? l(:button_unwatch) : l(:button_watch)
    url = watch_path(
      :object_type => objects.first.class.to_s.underscore,
      :object_id => (objects.size == 1 ? objects.first.id : objects.map(&:id).sort)
    )
    method = watched ? 'delete' : 'post'

    link_to text, url, :remote => true, :method => method, :class => css
  end