# File lib/sup/contact.rb, line 30
  def update_alias person, aalias=nil
    if(old_aalias = @p2a[person]) # remove old alias
      @a2p.delete old_aalias
    end
    @p2a[person] = aalias
    @a2p[aalias] = person unless aalias.nil? || aalias.empty?
  end