WHILE TAXIING ONTO THE RWY; RELIEF PLT ABOARD B747-400 ALERTS THE CAPT SHE IS ALIGNED WITH THE RWY EDGE LIGHTS VICE THE CTRLINE.

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I WAS IN THE SECOND JUMPSEAT. THE CAPT WAS CLRED FOR TKOF AND WAS TURNING FROM EBOUND TXWY B ONTO RWY 25R. THE CAPT MISTOOK THE R SIDE RWY LIGHTS FOR THE CTRLINE LIGHTS AND TURNED TOO SOON WHICH WOULD HAVE LED TO THE ACFT TAXIING OFF RWY. I WAS LOOKING IN ANOTHER DIRECTION AT THE TIME AND DID NOT HAVE A GOOD VANTAGE POINT FROM THE SECOND JUMPSEAT. THE OTHER RELIEF PLT IN THE FIRST JUMPSEAT NOTICED THE INCORRECT TAXI PATH AND IMMEDIATELY INSTRUCTED THE CAPT OF HER ERROR AND DIRECTED HER TO STRAIGHTEN OUT THE ACFT. THE FLYING FO AND FIRST OBSERVER AGREED THAT THE PATH OF THE ACFT DID NOT CROSS ANY RWY LIGHTS SO WE CONTINUED WITH THE TKOF. THE FIRST OBSERVER WAS VERY ALERT AND QUICK TO CALL THE ERROR. SUPPLEMENTAL INFO FROM ACN 795296: I NOTICED THE OVERSHOOT AND ALERTED HER TO 'STOP THE TURN!' AND SAID WE ARE TOO CLOSE TO THE EDGE LIGHTS. THE FLT WAS DELAYED 2 HRS PRIOR TO THE EVENT DUE TO A MAINT PROB. SUPPLEMENTAL INFO FROM ACN 795295: FO REALIZED THE TURN WAS TOO TIGHT AND CAUTIONED THE CAPT IMMEDIATELY TO STRAIGHTEN OUT TURN. CAPT THEN REALIZED HER DISORIENTATION PROB; TURNED BACK L TO REGAIN CTRLINE. FO'S EVALUATED R SIDE OF RWY EDGE TO DETERMINE LIGHTS NOR EXCURSION OF RWY OCCURRED.