A COMMERCIAL FIXED WING MLG ACFT AFTER RECEIVING TXWY INSTRUCTIONS TO HOLD SHORT ON THE TXWY CROSSED AN ACTIVE RWY DUE TO INATTN.

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AFTER LNDG ON RWY 13R AT DFW WE WERE TOLD TO HOLD SHORT OF RWY 18L AT TXWY A. THERE WERE 2 HVY ACFT HOLDING SHORT OF RWY 18R AT TXWY A ALREADY SO TWR TOLD US TO HOLD SHORT OF RWY 18L AT TXWY B. I READ BACK THE HOLD SHORT CLRNC AND THE CAPT ACKNOWLEDGED. I THEN CONTINUED TO CLEAN UP THE ACFT FINISH THE 'AFTER LNDG CHKLIST' AND WAS ABOUT TO CALL OUR RAMP WHEN THE CAPT SLAMMED DOWN ON THE BRAKES. I LOOKED UP FROM THE CHKLIST TO DISCOVER WE WERE IN THE MIDDLE OF RWY 18R. WE CONTINUED ACROSS RWY 18R TO HOLD SHORT OF RWY 18L. THE ACFT LNDG ON RWY 18R WAS AT ABOUT A 2 MI FINAL. THE CAPT EXPLAINED HE SAW THE ACFT AT 2 MI BUT WAS WATCHING THE ACFT HOLDING SHORT OF THE OTHER RWY (18L) AT TXWY A AND WAS PROCEEDING UP TO HOLD SHORT NEXT TO THEM ON TXWY B WHEN HE REALIZED WHERE HE WAS AND REMEMBERED HE WAS TO HOLD SHORT OF THE OTHER RWY 18R. THE CAPT WAS BUSY LOOKING AT THE OTHER ACFT AND WHERE THEY WERE HOLDING SHORT MORE THAN WHERE WE WERE ON THE AIRFIELD AND I SHOULD HAVE BACKED HIM UP BETTER BUT WAS BUSY WITH CHKLISTS AND CALLING RAMP.