SQL UPDATE Inner Joint

Good Afternoon,

Is there someone that can tell me what is wrong with this command.

Thanks,

UPDATE A_TEMP_R INNER JOIN PROJET INNER JOIN
      CORRESPONDANCE ON PROJET.NO_PROJET = CORRESPONDANCE.No_Projet
             ON A_TEMP_R.NoOrdreTravail = CORRESPONDANCE.No_Job
                  SET A_TEMP_R.NoProjet = [CORRESPONDANCE].[No_Projet]
WHERE (((A_TEMP_R.Journee)>='8/1/2010'));