FREIGHT ELEVATOR IN DENNING BLDG NOT WORKING PROPERLY - STOPPED ABOUT HALF WAY UP ON 1ST FLOOR. EE TRIED TO OPEN DOOR BUT IT WOULD NOT WORK PROPERLY. HE OPENED THE DOOR ON OPPOSITE SIDE & CLIM BED OUT OVER A BEAM THAT WAS ABOUT 10 FEET OFF BOTTOM FLOOR. WHEN HE STEPPED DOWN HE CUT HIS LEFT LITTLE FINGER & ALSO HIS RIGHT ARM.