LEARJET 35 FO OVERSHOT INITIAL CLB ALT AND HDG CHANGE DURING SID DEP. CAPT TOOK OVER ACFT CTLS AND RETURNED TO PUBLISHED PROC ALT AND HDG.

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THE NON TYPE RATED COPLT WAS FLYING THE LAST LEG OF THE TRIP FOR THE DAY FROM TEB TO ABE. WHILE PERFORMING THE TEB 4 SID WHICH CALLS FOR RWY HDG TO 1500 FT AND THEN A R TURN TO 280 DEGS THEN CLB TO 3000 FT AFTER XING TEB 4-5 DME; I WAS IN THE R SEAT AND WAS REACHING DOWN AND LOOKING DOWN FOR A CHART THAT HAD FALLEN DURING THE RAPID ACCELERATION ON TKOF. WHILE MY HEAD WAS DOWN; THE COPLT CLBED RIGHT THROUGH 1500 FT. I GOT HOLD OF THE AIRPLANE FROM HIM AT ABOUT 2200 FT AND GOT THE PLANE BACK DOWN TO 1500 FT AND MADE THE TURN TO 280 DEGS. IT TOOK A BRIEF STRUGGLE TO GAIN CTL OF THE PLANE FROM THE COPLT AS HE DID NOT THINK HE HAD DONE ANYTHING WRONG; AND DID NOT WANT TO RELINQUISH CTL OF THE PLANE. THE PROC HAD BEEN BRIEFED TO HIM 3 TIMES WHILE ON THE GND -- AS HAD EMER PROCS. AFTER I PERFORMED THE PROC AND EXPLAINED MYSELF TO THE CTLR; I GAVE THE PLANE BACK TO THE COPLT. HE WAS UNABLE TO FLY THE AIRPLANE CORRECTLY AT THIS POINT AS HE HAD 'FALLEN APART' AFTER BUSTING THE SID. HE WAS TOO WORRIED ABOUT LOSING HIS LICENSE OVER THIS AND WAS UNABLE TO PERFORM ANY DUTIES CORRECTLY FOR THE REST OF THE 20 MIN FLT. ALTHOUGH THE PROC HAD BEEN BRIEFED THOROUGHLY; I SHOULD NOT HAVE LOOKED DOWN FOR 1 SECOND DURING THE DEP -- AS THE COPLT HAS A HISTORY OF NOT BEING ABLE TO FOLLOW PROCS CORRECTLY.