FLC OF MLG ON APCH TO LAX 24R ENCOUNTERED AN SMT APCHING FOR 24L WHO CAME IN CLOSE PROX WHILE ON A VISUAL TO 24L.

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AT 1100 FT AGL; WE HAD JUST COMPLETED OUR FINAL ITEMS CHKLIST. UPON DOING SO; I ALWAYS LOOK L AND R TO ENSURE THE APCH AREA IS CLR. IT WASN'T; LOOKING L I SPIED AN SMT X AT OUR 8:30 POS; 'EVEN' WITH OUR ALT AND A MODERATE CLOSURE RATE ON A CONVERGING COURSE. I CALLED THE FO'S ATTN TO OUR FRIEND. THE FO GENTLY INCREASED OUR RATE OF DSCNT. MEANWHILE; SMT X CLOSED TO LESS THAN 100 FT BEFORE I SAW HIS NOSE ROTATE UP AND THE LNDG GEAR EXTEND. CAPT COMMUTER THEN PULLED UP AND ONTO HIS OWN FINAL APCH AND LANDED NORMALLY; AS DID WE. THE DOWN SIDE OF THE VISUAL APCH HAD RAISED ITS UGLY HEAD! THE SMT X HAD BEEN PROFFERED AND ACCEPTED A VISUAL APCH PREDICATED ON KEEPING OUR ACFT IN SIGHT. THE COMMUTER ACCEPTED THIS CLRNC WHILE OUR ACFT WAS POSITIONED DIRECTLY BENEATH AND ASTERN OF HIS ACFT. THE WX WAS 120 OVCST 1000 SCATTERED AND 4 MI HAZE/SMOKE. HIS EXTENDING LNDG GEAR AND JERKING HIS NOSE UP INDICATED TO ME THAT THIS WAS THE MOMENT AT WHICH TRUE VISUAL SEPARATION BEGAN. HE HAD BEEN INSTRUCTED TO MAINTAIN VISUAL SEPARATION WITH US. OBVIOUSLY HE NEVER HAD US; NOR THE ARPT IN SIGHT; WHY ELSE WOULD HE BE ON OUR LOC PATH AT SUCH CLOSE QUARTERS. THE SMT CAPT ACCEPTED A VISUAL IN MARGINAL VFR WITHOUT THE ARPT (WE COULDN'T SEE IT) OR US IN SIGHT. UNABLE TO SEE US OR THE ARPT HE PROBABLY FLEW THE LOC OFFSET. HIS ACCEPTING THIS 'VISUAL' WAS UNWHOLESOME AND CAVALIER; UNPROFESSIONAL; AND CONTRARY TO GOOD PLT PRACTICE; FARS; AND SAFETY. IF HE WANTS TO BE A 'COWBOY' HE SHOULD JOIN THE RODEO. BARRING THAT; THE AIM WOULD BE AN APPROPRIATE GIFT FOR CAPT COMMUTER. I HOPE WE ARE BOTH BETTER AIRMEN FOR THIS.