A CL65 FLT CREW FLYING THE SPUDS ARR TO PHL DEVIATED FROM THE CHARTED TRACK WHEN THE CAPT BECAME INVOLVED WITH THE FO REPROGRAMMING THE ARR.

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WE WERE ON THE SPUDS 1 ARR TO PHL AT 9000 FT MSL WITH AUTOPLT ON. I WAS THE PF. WE WERE TOLD TO FLY A HDG OF 180 DEGS AFTER SPUDS FOR VECTORS TO THE VISUAL APCH TO RWY 26. AFTER SPUDS; I SELECTED A HDG OF 180 DEGS; AND ASKED MY FO TO 'CLEAN UP THE FMS.' THIS MEANS THAT THE ILS 26 APCH IN THE FMS; AS A BACK-UP TO THE VISUAL RWY 26; WILL BE CONFIGURED FOR A VECTOR TO THE FINAL APCH COURSE; AND THE REMAINING ARR PROC WILL BE DELETED. I THEN SELECTED 'GREEN NEEDLES' (RADIO NAV COURSE GUIDANCE MODE) TO BE SET UP FOR THE ILS BACK-UP. NOT FAR N OF BOJID; THE APCH CTLRS ASKED US TO PROCEED DIRECT BOJID AND RESUME FLYING THE SPUDS 1 ARR. I ASKED THE FO TO RE-ENTER THE SPUDS 1 INTO THE FMS; SELECT DIRECT BOJID; AND VERIFY THAT THE ILS RWY 26 WAS STILL LOADED IN THE FMS. THE FO; BEING NEW TO THE ACFT; WAS INITIALLY UNCERTAIN HOW TO DO THIS. I TOLD HIM WHICH KEYS TO SELECT TO GET STARTED. ONCE DIRECT BOJID WAS ENTERED; I SWITCHED FROM HDG MODE TO NAV MODE TO FOLLOW THE FMS COURSE. WE THEN COMPARED THE PUBLISHED SPUDS 1 ARR AND ILS RWY 26 WITH THE WAYPOINTS IN THE FMS TO VERIFY THAT THEY MATCHED. SUDDENLY I REALIZED THAT ALTHOUGH I HAD SELECTED NAV MODE; I HAD NOT SWITCHED FROM 'GREEN NEEDLES' TO 'WHITE NEEDLES' (FMS COURSE GUIDANCE). THUS WE WERE STILL FLYING THE 180 DEG HDG. WE HAD PASSED BOJID AND WERE NEARLY TO HIFAL AND SLIGHTLY R OF COURSE. I IMMEDIATELY TURNED TOWARD THE NEXT WAYPOINT; EYRIE. WE OVERSHOT THE TURN AT HIFAL WHICH RESULTED IN BEING A MI OR TWO R OF COURSE BTWN HIFAL AND EYRIE BEFORE GETTING BACK ON COURSE BY EYRIE. THE APCH CTLR DID NOT SAY ANYTHING ABOUT OUR DEV. WE WERE THEN GIVEN VECTORS FOR THE VISUAL TO RWY 26; AND AN UNEVENTFUL APCH AND LNDG. IN RETROSPECT; I SHOULD HAVE DONE SEVERAL THINGS DIFFERENTLY. FIRST; SINCE I WAS FLYING WITH A NEW FO; I SHOULD NOT HAVE CALLED FOR THE FMS TO BE CLRED UP UNTIL I WAS SURE WE WOULD NOT BE TOLD TO REJOIN THE ARR. ALSO; WHEN I REALIZED THAT THE FO WAS UNSURE OF HOW TO RELOAD THE SPUDS 1; I SHOULD HAVE XFERRED THE FLYING DUTIES TO THE FO AND RELOADED THE ARR MYSELF. ALTHOUGH AT THE TIME I FELT THAT I WAS FLYING THE ACFT WHILE HE PROGRAMMED THE FMS; EVEN MY BRIEF COACHING OF HIM WAS ENOUGH TO DISTRACT ME FROM MY PRIMARY DUTY TO FLY THE ACFT. I HAVE ALWAYS TRIED TO FOLLOW THE RULE OF ONE PLT FLYING WHILE THE OTHER PROGRAMS THE FMS; BUT I WILL NOW BE EVEN MORE CAUTIOUS TO MAKE SURE THAT THE PF IS NOT DISTR LIKE I WAS.