AN MD80 COCKPIT DOOR OPENS DURING TKOF ROLL. THERE IS SOME DISAGREEMENT BTWN CREW MEMBERS AS TO WHETHER A REJECTED TKOF OR CONTINUING TO DEST WAS THE APPROPRIATE COURSE OF ACTION.

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ON TKOF ROLL; ALMOST IMMEDIATELY AFTER SELECTING AUTOTHROTTLES; THE COCKPIT DOOR SWUNG OPEN. AIRSPD WAS APPROX 60-70 KIAS. DECISION WAS MADE NOT TO ABORT. CAPT WAS FLYING. I MADE THE DECISION TO LEVEL AT 6000 FT TO DETERMINE WHAT WAS WRONG WITH THE DOOR. THE FLT ATTENDANT WAS TRYING TO CLOSE THE DOOR BUT SAID IT HAD COME OUT OF THE TRACK. I TURNED ON THE AUTOPLT; TOLD THE FO HE HAD THE ACFT; AND GOT OUT OF MY SEAT. AT THAT TIME; THE FLT ATTENDANT AND A DEADHEADING MD80 CAPT HAD CLOSED THE DOOR. I USED THE DEAD BOLT TO SECURE THE DOOR AND THEN CONTINUED THE FLT TO DEST. DURING THE TKOF; FO HAD STRONGLY RECOMMENDED ABORTING; SAYING 'AIRSPD IS LESS THAN 80 KTS; WE SHOULD STOP.' AT LEAST ONE MORE TIME HE RESTATED THAT WE SHOULD STOP. ONCE AIRBORNE; HE WANTED TO DECLARE AN EMER AND RTN TO DFW FOR AN IMMEDIATE LNDG. I LISTENED TO HIS SUGGESTIONS; BUT MY DECISION WAS TO CONTINUE THE TAKE OFF AND THEN ONCE THE PROB WAS CORRECTED; CONTINUE TO DEST. FO IS AN EXCELLENT PLT AND I RESPECT HIS JUDGEMENT. HOWEVER; IN THIS CASE; I FELT IT WOULD BE INAPPROPRIATE TO ABORT; AND THEN TO CONTINUE TO DEST ONCE THE DEAD BOLT WAS USED TO SECURE THE COCKPIT DOOR.