A B737-700 STRUCK A JETWAY WITH L ENG NACELLE WHILE BEING MARSHALLED IN TO GATE.

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APCHING GATE; WE VERIFIED THAT WE HAD 3 MARSHALLERS WITH LIGHTED WANDS AND THAT THE GATE AREA WAS CLR. THE MARSHALLING SEEMED TO BE PROCEEDING NORMALLY AS I WAS ABOUT TO STOP THE ACFT. THE MARSHALLER'S WANDS WERE A FEW INCHES APART AND WE WERE STILL ROLLING VERY SLOWLY WHEN WE FELT A BUMP AND THE ACFT STOPPED. WE ASSUMED WE HIT A CHOCK AND I SET THE PARKING BRAKE AND SHUT DOWN THE L ENG. THE R ENG HAD ALREADY BEEN SHUT DOWN. AT THIS POINT I NOTICED A FAIR AMOUNT OF COMMOTION ON THE RAMP AND I OPENED THE L1 WINDOW AND ASKED WHAT WE HIT. AT THAT POINT; SOMEONE TOLD ME THAT I HIT THE JETWAY. LOOKING AFT; OUT MY L1 WINDOW; I SAW THE TOP OF THE L ENG COWLING IN CONTACT WITH THE JETWAY. SEEMS THE YOUNG; CONTRACT MARSHALLER HAD TRIED TO STOP US ON THE B737-900 LINE WHEN WE WERE IN A -700. FROM THE COCKPIT; I HAVE NO GOOD WAY OF DETECTING THIS ERROR. OUR CONTRACT RAMPERS ARE PERHAPS WELL INTENTIONED BUT THEY DON'T KNOW THE FIRST THING ABOUT WORKING IN OR AROUND AIRPLANES. SUPPLEMENTAL INFO FROM ACN 704131: WE WERE BEING MARSHALLED IN TO GATE WITH WING WALKERS IN PLACE AT NIGHT. ABOUT 1 FT FROM STOPPING; AS INDICATED BY THE CONTRACT MARSHALLER'S WAND PLACEMENT; WE FELT A SLIGHT NUDGE THROUGHOUT THE ACFT. WE HOPED WE HAD ROLLED INTO A TIRE CHOCK. THE MARSHALLER INITIALLY INDICATED TO US TO CONTINUE THE TAXI FORWARD. CAPT LOOKED OUT HIS WINDOW AND SAW THAT THE L ENG NACELLE HAD CONTACTED THE JETWAY; AND ELECTED NOT TO CONTINUE THE TAXI FORWARD. AT THIS TIME THE MARSHALLER GAVE US THE STOP SIGNAL. WE SHUT THE AIRPLANE ENGS DOWN AND THE PAX WERE DEPLANED USING THE ROLL-UP STAIRS THROUGH THE AFT L EXIT.