B737 TURNED FINAL FOR WRONG RWY AT LAX DURING VISUAL APCH.

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WE WERE ARRIVING AND IT WAS THE FO'S LEG. THE WX WAS RPTED ON THE ATIS AS CLR AND 3 MI IN HAZE. SOCAL APCH HANDED US OFF TO LAX TWR WITH A BASE TURN TO FINAL AT ABOUT 9 MI FOR RWY 24R TO FOLLOW A SAAB; WHICH WE HAD RPTED IN SIGHT. AS WE WERE IN OUR TURN TO 150 DEGS; THE SAAB DISAPPEARED INTO THE HAZE AND I ASKED THE FO IF HE STILL HAD THE TFC IN SIGHT. HE SAID NEGATIVE; AND WE SWITCHED TO THE TWR FREQ AND CHKED IN FOR RWY 24R AND WERE CLRED TO LAND. THE SAAB WAS RPTED ON A 3 MI FINAL AND WE HAD ABOUT 5 MI OF TRAIL. ABOUT THAT TIME; I SAW THE RWY APPEARING AT ABOUT 12 O'CLOCK POS. AS WE WERE ROLLING OUT WITH A LITTLE OVERSHOOT; I NOTICED THAT IT APPEARED THAT WE WERE WELL L OF THE COURSE ON THE MAP DISPLAY. AT ABOUT THAT TIME; THE TWR SAID 'ACR X; ARE YOU CORRECTING TO THE R?' TO WHICH I RESPONDED YES; THINKING THAT WE WERE SLIGHTLY L OF RWY 24R. THAT'S WHEN THE FO MUST HAVE REALIZED THAT THE RWY HE FIRST SAW WHEN HE WAS TURNING BASE WAS ACTUALLY RWY 25R. WE HAD LINED UP ON THE WRONG RWY. BACK WHEN THE FO WAS CLRED FOR THE APCH; HE DISCONNECTED THE AUTOMATION AND HAND FLEW THE APCH. I BELIEVE BECAUSE OF THE VISIBILITY RWY 25R WAS THE FIRST RWY HE SAW AFTER WE LOST SIGHT OF THE SAAB. I THINK THAT I LOST SITUATIONAL AWARENESS WITH THE MAP BECAUSE I SPENT TOO MUCH TIME LOOKING FOR THE TFC SO THAT BY THE TIME I SAW THE DIVERGENCE TO THE S OF THE LOC THE DAMAGE WAS DONE. SOCAL APCH WILL CLR YOU FOR A VISUAL APCH WITHOUT THE ARPT IN SIGHT IF YOU RPT THAT YOU HAVE TFC IN SIGHT THAT HAS RPTED THE ARPT IN SIGHT. ONCE YOU DO THIS; YOU HAVE TAKEN FULL RESPONSIBILITY TO LINE UP ON THE CORRECT RWY. THE CIRCUMSTANCES LED US TO DROP OUR GUARD JUST LONG ENOUGH TO OVERSHOOT THE INTENDED RWY BECAUSE OF THE VISIBILITY. WE SHOULD HAVE BEEN MORE VIGILANT IN FLYING OUR INSTS ONCE WE LOST SIGHT OF THE SAAB.