# The args to use for a radio button set of roles.
  # Can be the args for a specific user, or a more
  # generic non-model form.
  def role_tag_args(role, user = nil)
    if user
      role_class = "user_role_#{role.name.downcase.gsub(" ", "_")}"
      ["user[role_ids][]", role.id, role_selected?(user, role), {:id => role_to_id(role), :class => role_class}]
    else
      ['role_ids[]', role.id, (role.name == 'Contributor'), :style => 'margin-bottom: 2px;']
    end
  end