CORPORATE MLG CROSSES RWY WHEN INSTRUCTED TO HOLD SHORT.

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I WAS IN THE L SEAT; THE PIC IN THE R. WE WERE TAXIING FROM OUR HANGAR TO RWY 15 FOR TKOF. IN THE PROCESS WE WERE REQUIRED TO CROSS THE FAR END OF RWY 15 AND RWY 8. DURING THE PROCESS THERE WAS SOME CONFUSION IN MY MIND ABOUT OUR TAXI CLRNC. I ASKED THE CAPT 'CLRED TO CROSS?' AND HE WAS BUSY AND APPARENTLY DIDN'T HEAR ME SO I SAID AGAIN; 'CLRED TO CROSS?' HE THEN LOOKED UP AND ACKNOWLEDGED BY ADVISING GND CTL. I AM NOT SURE AT THIS TIME WHO SAID WHAT TO WHOM; BUT IN MY MIND WE WERE CLRED TO CROSS. AS WE WERE NEARING RWY 8 I LOOKED TO THE APCH END TO SEE A B737 TOUCHING DOWN OR JUST ABOUT TO DO SO. I HAD 3 OPTIONS: 1) STOP; 2) MAKE A U-TURN ONTO THE RAMP; OR 3) PROCEED ACROSS THE RWY. MY IMMEDIATE RESPONSE/REACTION WAS TO CONTINUE ACROSS THE RWY BECAUSE I WAS SURE I HAD TIME TO DO THAT. SO I PROCEEDED. I FAILED IN 2 OR 3 AREAS. 1) FAILED TO STOP THE ACFT UNTIL ALL CONFUSION WAS RESOLVED IN THE COCKPIT. 2) FAILED TO CHK THE RWY BEFORE I COULD EASILY STOP IF REQUIRED. ATC LATER ADVISED OUR CHIEF PLT THAT THE SEPARATION WAS SUCH THAT THERE WAS NOT A PROB BUT OF COURSE I DIDN'T KNOW THAT AT THE TIME. I FEEL PRIMARILY RESPONSIBLE FOR THIS INCIDENT. CLASSICAL COMPLACENCY ON AN OTHERWISE BEAUTIFUL DAY. ALSO; WE HAD SOME PROBS WITH A STUCK MIKE (NEW REPLACEMENT MIKE) AND A PROB WITH THE OTHER COM (THE ONE IN USE) XMITTING CARRIER ONLY WITHOUT THE MIKE BEING VERY CLOSE AND SPEAKING FIRMLY. I HAVE LEARNED A LOT FROM THIS INCIDENT. HOPEFULLY ENOUGH TO GET ME THROUGH TO RETIREMENT. ALSO A TREMENDOUS REAPPRECIATION FOR THE RESPONSIBILITIES OF THIS JOB AND FOR THE SANCTITY OF HUMAN LIFE. I THANK GOD FOR HIS GRACE AND MERCY IN THIS.