AN MD80 CREW TOOK OFF AT DFW WITH PERFORMANCE FIGURES FOR ANOTHER RWY.

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INITIAL TPS AND ATIS WERE FOR TAKING OFF TO THE S. WHEN WE CALLED FOR TAXI; WE WERE GIVEN KEG FOR RWY 35L AND OBTAINED THE TPS THROUGH ACARS. DURING TAXI; WE DISCOVERED AN ACFT PROB THAT WE MIGHT HAVE TO RETURN TO THE GATE FOR. GND LET US TURN AROUND ON A PARALLEL TXWY SO WE COULD STOP AND LOOK AT THE PROB WHILE GETTING OUT OF THE WAY OF OTHER FIELD TFC. IT TOOK A FEW MINS TO TAXI TO THE SPOT GND HAD DESIGNATED -- BY THEN THE FO HAD FIXED THE SMALL PROB. WE INFORMED GND -- REJOINED OUR ORIGINAL TAXI CLRNC -- AND COMPLETED THE CHKLISTS. WHEN WE WERE SWITCHED TO TWR FREQ THERE WERE 3 OTHER ACFT AHEAD OF US. TWR ASKED IF 'ANYONE HAD NUMBERS FOR RWY 35.' I HAD THE FO INFORM THEM THAT WE DID. THEY HAD US TAXI AROUND THE OTHER THREE. WHILE WE WERE MANEUVERING WE WERE CLRED ON TO HOLD RWY 35C. THERE WAS SOME CONFUSION IN THE COCKPIT. I THOUGHT WE WERE GOING TO BE CLRED ONTO RWY 35L AND ASKED THE FO TO CONFIRM WITH TWR. TWR WAS BUSY WITH LNDG TFC SO THE CONFIRMATION ON WHICH RWY TOOK A LITTLE LONGER. DURING THIS; AND WITH CONFIRMATION FROM TWR THAT RWY 35C WAS CORRECT; I MISTAKENLY THOUGHT WE HAD THE NUMBERS FOR RWY 35C AND HAD USED THIS DURING THE CHKLIST -- WE TOOK OFF. I FORGOT THAT WE ACTUALLY HAD PLANNED FOR RWY 35L. THE FLT PLAN WAS SLIGHTLY LONG AND WE HAD USED SOME TIME WITH THE ACFT PROB. IN MY HASTE; I FORGOT WHICH RWY WE HAD PLANNED FOR THINKING THAT IT HAD BEEN RWY 35C ALL ALONG. THE FO REALIZED OUR MISTAKE AFTER TKOF. HE PULLED UP A TPS FOR RWY 35C AND THEN INFORMED ME THAT WE TOOK OFF WITH THE NUMBERS FOR RWY 35L. THE TPS FOR RWY 35C WAS EXACTLY THE SAME AS THE ONE FOR RWY 35L; THOUGH I KNOW THAT DOES NOT REALLY MATTER AFTER THE FACT. OUR ORIGINAL TPS SHOWED THAT WE WERE GOOD FOR RWYS 17R AND 17C WITH THE SAME NUMBERS. CLOSEOUT WAS 100 LBS LIGHT. WX WAS VFR WITH A SLIGHT HEADWIND FOR A RWY 35 TKOF. WE WERE DISTRACTED WITH THE 360 DEG TURN TO GET OUT OF THE WAY AND FIX A PROB DURING TAXI. I KNEW OUR FLT PLAN WAS SLIGHTLY LONG -- THOUGHT WE WERE CAUGHT UP WITH OUR CHKLIST PROCS; AND WAS TRYING TO BE AS EXPEDITIOUS AS POSSIBLE SO WE WOULD NOT BE TOO LATE GETTING INTO LGA. FEELING CONFIDENT THAT WE WERE BOTH 'UP TOP SPD' -- I DID NOT STOP AND INSURE THAT WE HAD THE RIGHT NUMBERS AND BOTH OF US WERE REALLY READY FOR TKOF; ESPECIALLY WHEN 3 OTHER ACFT WERE WAITING FOR DEP AHEAD OF US. THIS WAS THE LAST DAY OF A 2-DAY SEQUENCE AND OUR 4TH LEG TOGETHER -- THE FO WAS EXTREMELY STRONG AND COMPETENT. THE SMALL PROB WE HAD BEFORE TKOF WAS DUE TO A SWITCH ERROR BY THE FO -- THE HYD PUMPS WERE PLACED IN LOW AFTER CHKING THE R ENG HYD PUMP DURING THE TAXI CHK RESULTING IN BOTH REVERSER ACCUMULATOR LOW LIGHT ILLUMINATING. I BELIEVE THE HYD CHK WAS INTERRUPTED BY THE REQUEST TO PICK UP A TPS FOR RWY 35L. I THINK THE FO WAS A LITTLE PREOCCUPIED WITH THE SMALL FIRST MISTAKE AND HELPING ME CONFIRM THE RWY WITH TWR -- WHILE I WAS PUSHING TO GET US OFF THE GND QUICKLY SO WE COULD MAKE UP THE TIME. I DID NOT REALIZE THAT I WAS PUSHING TOO HARD. HE INFORMED ME AFTER TKOF WHEN HE REALIZED THAT WE TOOK OFF WITHOUT NUMBERS FOR RWY 35C.