B737-200 ACFT ON SID CLB WAS ALERTED BY CTLR OF SKYDIVING ACFT. RPTR FLC SAW ACFT AND TOOK EVASIVE ACTION AS A RESULT OF TCASII RA. ACFT FLEW ABOVE ASSIGNED ALT WHEN CAPT; PF; WAS WATCHING INTRUDER.

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DURING CLB OUT ON THE PRADO 5 SID; ONT; CA; WE HEARD ATC TALKING TO 2 SKYDIVING ACFT. WHEN OUR FLT TURNED THE CORNER AT SLI VOR 080 DEG RADIAL AND BEGAN FLYING TOWARD TRM VOR; ATC TOLD US ABOUT 2 SKYDIVING ACFT IN OUR 11 O'CLOCK POS. THE CAPT AND I BOTH SAW THE TARGETS IN OUR 11 O'CLOCK POS AND 5 MI AWAY. TCASII WARNED US ABOUT A SINGLE ACFT; OBVIOUSLY ONE OF THE TARGETS WE WERE LOOKING AT. I TOLD THE CAPT THAT THE TARGETS COULD BE A PROB SINCE THEY HAD LITTLE APPARENT MOTION IN OUR WINDSCREEN. THE CAPT TOLD ME THAT WE WOULD CLB ABOVE THEM. WE WERE AT 12500 FT MSL CLBING AT 300 KTS. OUR ASSIGNED ALT WAS 14000 FT. AS WE CLOSED THE DISTANCE TO THE SKYDIVING ACFT IT WAS CLR TO ME THAT WE WERE GOING TO HAVE A CLOSE ENCOUNTER. THE TCASII GAVE US INSTRUCTIONS TO DSND TO AVOID THE FIRST ACFT. THE CAPT COMPLIED INSTANTLY. THE TCASII THEN TOLD US TO CLB TO AVOID THE SECOND ACFT. THE CAPT COMPLIED AGAIN. I SAW A CASA TYPE ACFT RECEDING ON OUR L SIDE. THE VELOCITY DIFFERENCE WAS TREMENDOUS. THE TCASII INFORMED US WE WERE CLR OF THE CONFLICT. WE WERE PASSING 13000 FT MSL. I GAVE THE REQUIRED '1000 FT TO GO ' CALL. THE CAPT WAS STILL LOOKING OUT THE L WINDOW AT THE RECEDING SKYDIVING ACFT AND DID NOT RESPOND. OUR VERT SPD WAS GREATER THAN 3000 FPM. I TOLD THE CAPT TO WATCH THE ALT. THE AUTOPLT DIDN'T CAPTURE THE ALT (14000 FT MSL) AND WE OVERSHOT BY 800 FT. WE DIDN'T VIOLATE ANY OTHER ACFT'S AIRSPACE AND DSNDED BACK TO 14000 FT MSL. THE CAPT SHOULD HAVE REQUESTED A VECTOR OR LEVELOFF WHEN WE FIRST HAD VISUAL CONTACT WITH THE 2 ACFT.