CL65 CAPT TURNS THE OPPOSITE WAY DURING TAXI OUT TO THE OPPOSITE END OF THE RWY TO WHICH CLRED.

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EARLY MORNING TAXI TO RWY 31 AT BNA. TAXI INSTRUCTIONS WERE TO TAXI VIA TXWYS T1; B; L; TO RWY 31. CAPT WAS TAXIING WHILE I WAS PERFORMING THE PRETKOF AND TAXI CHKS DIVERTING MY ATTN. WHEN TURNING ONTO TXWY L; WE MADE A R TURN INSTEAD OF A L TURN ONTO TXWY L. THE CAPT HAD BEEN TO BNA MANY TIMES BEFORE AND HAD ALWAYS USED RWY 13; THUS CONFUSING HIM INTO HABITUALLY MAKING A R TURN ON TXWY L. WE SUBSEQUENTLY TAXIED ACROSS RWY 2L. I FIRST REALIZED OUR MISTAKE WHEN THE CAPT CALLED 'CLR L.' I THEN LOOKED UP FROM MY PRETKOF CHKLIST AND CALLED 'CLR' R; CONFIRMING THE RWY WAS CLR. AFTER WE CROSSED; I REALIZED WHAT WE HAD DONE; AS DID THE CAPT. WE ASKED GND CTL FOR A 180 DEG TURN BACK TO RWY 31; WHICH WAS GRANTED. THE RWY 2L WAS NOT IN USE FOR DEPS AT THE TIME FOR TURBOJETS; BUT WAS LISTED ON THE ATIS. THE CAUSE OF THIS INCIDENT WAS THE CAPT'S WRONG TURN AND MY NOT CATCHING IT AS MY ATTN WAS DIVERTED. WE HAVE BOTH LEARNED A VALUABLE LESSON. IN THE FUTURE; I WILL FOLLOW OUR TAXI MORE CLOSELY AND NOT LET MY ATTN GET DIVERTED. I AM RELIEVED THAT WE CONFIRMED THE RWY WAS CLR OF TFC BEFORE XING.