prototype helper

    link_to_remote(dues.email_link, 
      :url => send_notices_flight_flight_due_path(@flight, dues),
      :before   => "Element.show('spinner')",
      :complete => "Element.hide('spinner')",
      :method	=> :post,
      :confirm  => confirm) 
      
    
    link_to(dues.email_link, 
      send_notices_flight_flight_due_path(@flight, dues),
      remote: true, 
      method: :post, 
      confirm: confirm)