AIR CONDITIONING SMOKE ON TKOF LEADS TO A LNDG AT A NEARBY ARPT WHERE APCH TO THE WRONG RWY WAS POINTED OUT BY TWR AT THE LAST MIN.

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SMOKE IN CABIN. ON TKOF FROM LGA A PUNGENT ODOR BEGAN COMING OUT OF THE AIR CONDITIONING SYS. SHORTLY AFTER; FLT ATTENDANT #1 CALLED TO INFORM US THE CABIN WAS FILLING WITH BLUE SMOKE. WE OPENED THE COCKPIT DOOR AND VERIFIED THE SMOKE. WE LEVELED OFF AT 9000 FT AND DECLARED AN EMER. WE MADE AN UNEVENTFUL LNDG AT EWR. WE TAXIED TO THE GATE AND DEPLANED VIA THE JET BRIDGE. THERE WERE NO RPTED INJURIES; ILLNESS; OR PAX DISCOMFORT. POINTS OF INTEREST AND A FEW LESSONS LEARNED DURING THIS EVENT. WE WERE CLRED FOR VISUAL RWY 22L AT EWR. THE TWR HAD TURNED THE LIGHTS UP ON RWY 22R AND DOWN ON RWY 22L. THE LOC FREQ WAS TUNED IN FOR RWY 22L. THE CAPT INADVERTENTLY LINED UP ON RWY 22R; BECAUSE THE LIGHTS WERE UP AND IT WAS JUST AFTER SUNRISE. HE SAYS HE FOCUSED IN ON THE LIGHTS OF THE RWY. THE WX WAS CLR. THE COPLT WAS RUNNING THE BEFORE LNDG CHKLISTS AND GETTING THE SPDS. WHEN I LOOKED UP AT 1000 FT; HE WAS LINED UP ON A RWY. THE APCH WAS STABLE; NOTHING SEEMED WRONG. THEN THE TWR INFORMED US WE WERE LINED UP ON THE WRONG RWY. THE CAPT DID A GREAT SIDE STEP AND WE LANDED WITHOUT INCIDENT.