A B733 CREW; TAXIING FOR TKOF AT JAX; TAXIED PAST THE HOLD SHORT LINE.

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WE WERE #1 AT RWY 7 FOR TKOF. TWR BROKE A CESSNA OFF A PRACTICE APCH; HAD TO CALL HIM 3 TIMES. TWR TOLD US CLRED FOR IMMEDIATE TKOF ON RWY 7; THEN CAPT PWRED UP ACFT. WE CROSSED HOLD SHORT; BUT BEFORE HE (CAPT) COULD GET OUT WORDS BELOW THE LINE; TWR CALLED US TO IMMEDIATELY HOLD POS. CESSNA HAD ALREADY COME RIGHT IN FRONT OF US AND DID A TOUCH AND GO; WITH MD80 ON SHORT FINAL. WE WERE ABOUT 10 FT OVER THE HOLD SHORT WITH BRAKES NOW SET. IT WOULD HAVE BEEN TIGHT FOR TKOF; TWR TOLD MD80 HE WAS OK AND CLRED TO LAND. I TOLD TWR WE WERE OVER THE LINE. MD80 LANDED UNEVENTFULLY THEN WE WENT TO POS AND HOLD; AND TOOK OFF. RPT FILED BECAUSE WE WERE 10 FT OVER HOLD SHORT LINE IN FRONT OF MD80 WHEN THEY LANDED. I THINK TWR DID THE RIGHT THING. SUPPLEMENTAL INFO FROM ACN 541939: WE WERE TOLD TO HOLD SHORT AND WE STOPPED WITH THE NOSE OF THE ACFT ABOUT 10 FT PAST THE HOLD SHORT LINE. THE FO TOLD THE TWR WE WERE PAST THE HOLD SHORT LINE. I SET THE PARKING BRAKE AND TWR TOLD THE MD80 THAT THEY WERE CLR TO LAND.