If I buy remote for central locking on my peugeot 406 will it work ?

I have a 406 peugeot and cant lock doors from outside..I can lock from inside so I think the central locking must be working...I wasnt given remote etc when bought car..was just told it only locks with key(but since found it doesnt) If I bought a remote will it work my central locking? do these kits work? or will I need to completely change the central locking system in car..........or is there a remote/fob system that will work for me?|||here's a link to them on ebay motors.