LJ60 FO EXCEEDED ATC ASSIGNED ALT DEPARTING TEB. THE FO HAD + - 500 FT EXCURSIONS FROM THE ALT HE WAS SUPPOSED TO FLY.

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ON A QUICK HOP FROM TEB TO HPN WE WERE ON AN ASSIGNED HDG FROM NY DEP AND CLRED TO 3000 FT. I WAS SWITCHING OUT CHARTS (VERY SHORT LEG) AND WORKING RADIOS. I LOOKED AT THE ALTIMETER AND SAW US GOING THROUGH 2500 FT. THE NEXT THING I KNOW MY FO SAYS OH #$&*; AND I LOOK UP AND SEE WE ARE AT 3500 FT (500 FT HIGH). HE HAD ALREADY BEGUN A RECOVERY AND WE NEVER WENT ABOVE 3500 FT AND QUICKLY RETURNED TO 3000 FT. THE CTLR REPEATED MAINTAIN 3000 FT AFTER WE HAD BEGUN THE RECOVERY. THE WHOLE EVENT OCCURRED IN LESS THAN 30 SECONDS. WHEN WE TALKED ABOUT WHAT HAPPENED MY FO SAID THAT HE HAD BEEN DISTRACTED BY SOMETHING THE FMS WAS DOING AND WITH ME CHANGING OUR CHARTS THAT MEANT TWO HEADS DOWN IN THE COCKPIT. LOOKING BACK; I KNOW WE WERE IN A HURRY TO GET DONE. IT WAS MY FO'S LAST DAY OF ROTATION AND I WANTED TO GET TO THE HOTEL BECAUSE THEY HAD A GOOD WORKOUT FACILITY AND I WANTED TO USE IT BEFORE I WENT INTO REST AT XA00. ON A SHORT VMC TRIP LIKE THAT I SHOULD HAVE HAD BOTH ARPT CHARTS OUT AND BEEN PAYING MORE ATTENTION TO THE SIT. ALSO IN THAT SIT ON VECTOR IN VMC CONDITIONS AND BOTH OF US BEING FAMILIAR WITH THE AREA; THE FMS SHOULD BE THE LEAST OF OUR WORRIES. I FEEL THAT BOTH OF US WERE PREOCCUPIED BY THINGS OTHER THAN WHAT WAS IMPORTANT (SIT AWARENESS) WHICH CAUSED AN ALT DEVIATION IN ONE OF THE WORST PLACES IT COULD HAPPEN.