A B727 FLC TAXIED ACROSS AN ACTIVE RWY AT CDG; FO.

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TAXIING S ON TXWY F; APCHING K LOOP; TOLD 'TAXI SHORTEST WAY' TO RWY 8L. HAD PREVIOUSLY BEEN TOLD TO 'TAXI RWY 8L W1.' CAPT HAD NO EXPERIENCE IN EUROPE; I OVER 2 YRS EXPERIENCE. DARK EVENING WITH NO OTHER GND TFC. ON S SIDE OF K LOOP; TOLD 'CLRED FOR TKOF RWY 8L.' STOPPED AT APPROX R TURN ON S1 (SEE ATTACHED CHART). I THOUGHT WE WERE AT W1. CONTINUED TAXI AND CROSSED RWY 8L AT S1 THINKING THE HOLD SHORT LIGHTS WE COULD SEE WERE FOR WY 8L -- THEY WERE FOR RWY 8R. AS WE EXITED RWY 8L SBOUND; FE SAID 'I THINK WE JUST CROSSED A RWY.' STOPPED AT S1. INFORMED GND OF OUR LOCATION. RECLRED BACK ONTO RWY 8L ON S2 FOR TKOF. PARIS HAS UNSATISFACTORY GND MARKINGS. VERY CONFUSING. DUE TO TAXI RTE; WE DID NOT CROSS ANY STOP BARS! IT WAS DARK AND NO OTHER ACFT TO JUDGE OUR LOCATION FROM. GND WAS OF NO HELP. CONFUSION IN COCKPIT. CAPT WAS RELYING ON ME FOR GND GUIDANCE. TO DO AGAIN; I WOULD HAVE HAD CAPT STOP PLANE AND WE WOULD HAVE DISCUSSED RTE HE WANTED TO TAXI TO GET TO RWY. NO HELP FROM GND CTL. UNSATISFACTORY GND MARKINGS. SUPPLEMENTAL INFO FROM ACN 451425: BOTH COPLT AND MYSELF HAVE TAXI CHART OUT. WE REQUEST FURTHER INSTRUCTIONS 3 TIMES DURING TAXI. COPLT AND I DISAGREED ON WHICH WAS SHORTEST RTE. I WANTED TO GO VIA W1; HE VIA K3; W2 TO W1. SUPPLEMENTAL INFO FROM ACN 451276: IT WAS DARK; THERE WERE NO RED HOLD SHORT LIGHTS ON OUR RTE OF TAXI. THE RWY EDGE LIGHTS WERE OFF; AND THE CTRLINE LIGHTS WERE NOT VISIBLE.