S80 FLC INCORRECTLY SETS UP AND BRIEFS FOR WRONG APCH WHICH IS CAUGHT WHEN C90 ADVISES FLC.

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THE FO WAS FLYING. AT THE INITIAL CONTACT WITH ORD APCH; WE WERE ADVISED TO MAKE THE ILS RWY 22R. WE WERE ON THE PMM 4 ARR; TRACKING OBK 081 DEG RADIAL WITH #2 VOR. SOMEWHERE BTWN PIVOT AND PAPPI INTXNS AT 8000 FT; THE APCH CTLR GAVE US 'CLRED FOR THE ILS RWY 22R APCH' CLRNC. SINCE WE WERE NOT ON RADAR VECTOR AT THAT POINT; SUDDEN CLRNC TO 'CLRED FOR APCH' WAS A LITTLE SURPRISING AND PUZZLING TO BOTH OF US. I TUNED MY #1 NAV TO ORD VOR FOR THE DME FIXES OF ILS RWY 22R AND 220 DEG COURSE. I THOUGHT THE FO WAS TUNING HIS #2 NAV TO THE ILS RWY 22R. WHILE I WAS TRYING TO LISTEN TO THE MORSE IDENT ON THE #2 NAV; I WAS ALSO RUNNING THE MECHANICAL CHKLIST; LISTENED TO THE APCH; AND MAKING THE LNDG PA. I WAS TOO BUSY TO CATCH THE WRONG FREQ SET ON THE #2 NAV. THE #2 NAV IDENT SOUNDED A LITTLE FUNNY COMPARED TO MY ILS RWY 22R APCH PLATE (THE MORSE CODES OF ILS RWY 22L AND RWY 22R ARE SIMILAR) BUT LOOKED LIKE THE LOC WAS ALREADY ARRIVING AND ACFT WAS INTERCEPTING (MY #1 NAV WAS STILL ORD VOR AND IT LOOKED LIKE THE RADIAL WAS WITHIN 1 DOT) SO I DECIDED TO ACCEPT THE IDENT AND TOLD MY FO 'LOC IDENTED.' AS WE TURNED INBOUND THE ILS RWY 22L COURSE; THE APCH CTLR ASKED US IF WE WERE RECEIVING THE LOC OK. I TOLD HIM 'THAT'S AFFIRMATIVE.' ALL THIS TIME; I THOUGHT WE WERE TRACKING RWY 22R. THEN THE APCH CTLR TOLD US WE WERE TRACKING THE ILS RWY 22L. I LOOKED AT #2 NAV AND REALIZED IT WAS SET 110.1; NOT RWY 22R. I TOLD MY FO TO SET 111.3; AND THEN I TOLD THE APCH CTLR 'OK; WE ARE FIXING IT.' HE TOLD US 'R TURN 250 DEGS; INTERCEPT ILS RWY 22R.' I ACKNOWLEDGED IT. WE INTERCEPTED RWY 22R LOC AND COMPLETED REST OF THE APCH AND LNDG NORMALLY. SUPPLEMENTAL INFO FROM ACN 500310: I TURNED TO WHAT I THOUGHT WAS THE RWY 22R APCH PAGE; BUT INSTEAD SELECTED RWY 22L. I IMMEDIATELY BEGAN TO SET UP THE APCH FOR RWY 22L. THE CAPT CALLED FOR CLARIFICATION OF THE APCH CLRNC SINCE WE WEREN'T ON A VECTOR; AND IT WAS CONFIRMED. I BRIEFED THE WRONG APCH AND IT WAS NOT CAUGHT BY THE CAPT. I REALIZED ALMOST IMMEDIATELY IT WAS INCORRECT WHEN FNUCH DID NOT APPEAR ON THE RWY 22L APCH PLATE. AS I CHANGED FREQ AND BEGAN TO CORRECT; APCH CTL CAME ON AND SAID WE WERE 3 MI E OF COURSE AND APPEARED TO BE LINING UP ON RWY 22L.