LGT LINED UP FOR WRONG RWY ON VISUAL APCH AND HAS CLOSE PROX WITH MLG.

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VISUAL APCHS TO RWY 26L AND RWY 26R WERE IN USE. WE WERE COMING IN FROM THE N. THE MLG Y WAS COMING IN FROM THE SE. THE MLG Y WAS CLRED VISUAL APCH 26R AND WE WERE CLRED VISUAL APCH 26L. THIS REQUIRED A CRISS-CROSS FOR BOTH OUR ACFT TO ALIGN OURSELVES TO FINAL APCH. I HAVE FLOWN IN AND OUT OF DEN HUNDREDS OF TIMES IN THE LAST 7 YRS. STANDARD PROCS ARE: ACFT FROM S ON 26L; ACFT FROM N ON 26R. 99 PERCENT OF THE TIME THIS IS THE WAY IT IS DONE AND RIGHTLY SO. WHILE THE CAPT AND SO WERE AWARE THAT WE WERE CLRED FOR THE L RWY; I ASSUMED WE WERE CLRED FOR THE R. WHEN I WAS IN A R TURN FOR THE FINAL APCH COURSE; I COULD NOT SEE THE MLG Y. THE OTHER CREW MEMBERS QUESTIONED MY INTENTIONS AND IT WAS THEN I REALIZED MY MISTAKE. I QUICKLY SQUARED MY BASE SO AS TO GO BEHIND HIM. WE WERE ABOUT 700-1000 FT ABOVE HIM BUT ONLY 2400 FT HORIZLY. I FEEL THIS WAS A LITTLE CLOSE; BUT NOT IN ANY DANGER. THE CTLR COULD HAVE EASILY CHANGED OUR RWYS; WHICH WOULD HAVE MADE A SAFER SITUATION. I AM RPTING THIS SO PERHAPS ADDITIONAL RULES MIGHT BE CONSIDERED WITH THIS PARTICULAR TYPE OF VISUAL APCH. IT DOESN'T MAKE GOOD SENSE TO CRISS-CROSS ACFT TO THE FINAL APCH COURSE.