FO TUNED IN WRONG RWY LOC FREQ RESULTING IN ATC INTERVENTION BECAUSE OF APCH TO THE WRONG RWY.

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ACR X WAS ON RADAR VECTORS IN THE TERMINAL AREA OF ATL LNDG E. AFTER MULTIPLE VECTORS (ACR X) WAS GIVEN A HDG OF 070 DEGS TO INTERCEPT THE RWY 9R LOC ABOUT 17-22 MI OUT. THE COPLT (MYSELF) HAD PUT IN THE WRONG FREQ (RWY 8L) AND A RUSHED 2-MAN COCKPIT DID NOT CATCH IT EVEN AFTER RUNNING THE APCH CHKLIST. THE CAPT NOTICED A DISPARITY BTWN THE NAV DISPLAY COURSE AND THE ILS. THINGS WERE HAPPENING VERY FAST AND THE COCKPIT CREW WAS CONCERNED AS THE TCASII DISPLAY SHOWED MULTIPLE TARGETS FOR A BUSY APCH PATTERN. WE WERE INTERCEPTING THE WRONG ILS (RWY 8L) WHEN APCH QUERIED US ABOUT BEING N OF COURSE AND WE CAME BACK THAT WE WERE S OF COURSE. APCH THEN ISSUED A HDG OF 250 DEGS THAT DID NOT MAKE SENSE AND THE COCKPIT MADE A QUERY ON THE VALIDITY OF THE HDG. A SUBSEQUENT HDG AND ALT CHANGE WAS ISSUED TO TURN S WITH THE FREQ FOR THE CORRECT RWY TO ACR X. DURING THIS TIME THE CAPT REMEMBERS A TCASII TA. THE CTLR SEEMED TO BE A LITTLE PUZZLED AT WHAT WAS GOING ON; THE SAME WITH THE COCKPIT CREW. SOON ALL SEEMED AWARE THAT THE COCKPIT CREW HAD BEEN ATTEMPTING TO INTERCEPT THE WRONG ILS FREQ TO THE WRONG RWY. SUBSEQUENT APCH AND LNDG WERE UNEVENTFUL. I SET THE WRONG ILS FREQ BECAUSE I TURNED MY COM PAGE TO CHK THAT THE CORRECT RAMP FREQ WAS SET AND THEN I GOT DISTR. MY PAGE WAS LEFT OPEN TO THE RWY 8L PAGE WHICH IS LOCATED ON THE R SIDE OF THE 2 PAGES THAT PLTS GET TO SEE. WHEN I HAD PREVIOUSLY BRIEFED THE APCH; THE RWY 9R PAGE WAS ALSO LOCATED ON THE R SIDE OF THE OPEN NAV BOOK. THAT IS BECAUSE BOTH RWYS OFFER CAT II'S AND CAT III'S WHICH ARE LOCATED ON THE BACK OF THE CAT I'S. I LOOKED WHERE I EXPECTED TO SEE THE FREQ AND I SAW WHAT I EXPECTED TO SEE. WITH THE ATC VECTORING AND QUERYING ATC; THE APCH CHK WAS PROBABLY RUSHED AND THE CAPT JUST COPIED THE FREQ THAT I HAD SET INCORRECTLY INTO HIS OWN WINDOW; AND IN A RUSHED ENVIRONMENT IT IS DIFFICULT TO DISTINGUISH THE MORSE CODE DIFFERENCES BTWN ILS FREQS.