FLT CREW BRIEFED APCHS FOR BOTH RWYS AND PUT THEM IN THE FMS. ATC ASSIGNED RWY 26L BUT CHANGED BY GIVING THE FAF BUT NOT THE RWY NUMBER.

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AFTER CHKING WITH APCH AND ADVISING THEM WE HAD THE ATIS WE BELIEVE WE WERE TOLD TO EXPECT RWY 26L; HOWEVER WE KNEW THAT THEY WERE LNDG RWY 26L AND R SINCE WE HAD HEARD THEM CLR A PRECEDING ACFT TO EXPECT RWY 26R; AND IT WAS ON THE ATIS. WE BRIEFED BOTH APCHES AND HAD RWY 26L IN THE MAIN AND RWY 26R IN THE STANDBY NAV RADIOS. AFTER GIVEN OUR INITIAL HDG TO INTERCEPT RWY 26L WE WERE THEN CLRED FOR THE ILS RWY 26R. WE QUERIED THE CTLR WHEN HE GAVE US 190 KTS TO CHUBS WHICH WAS ON THE RWY 26R APCH. HE TOLD US WE SHOULD HAVE BEEN TOLD RWY 26R AND VECTORED US FOR THAT APCH. WE SWITCHED THE FREQUENCIES; CHANGED THE FMS; AND BRIEFED THE CHANGES. AFTER THE INITIAL VECTOR AND CHANGES WE FOUND OURSELVES MOMENTARILY THROUGH THE LOC COURSE FOR RWY 26R; BUT IT DID NOT CAUSE ANY CONFLICTS. WE FLEW THE RWY 26R APCH WITHOUT ANY FURTHER CONFUSION. THE REASON I AM FILLING OUT THE RPT IS TO MAKE PEOPLE AWARE; IF THERE IS EVER A DOUBT IN YOUR MIND AS TO THE APCH YOU ARE ASSIGNED; YOU SHOULD ALWAYS QUERY ATC.