ON INITIAL TKOF FROM MKE RWY 19R; B190 FLC OBSERVE A B757 ON INITIAL TKOF FROM INTERSECTING RWY 7R AND TAKE EVASIVE ACTION TO AVOID THE B757.

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WE WERE INSTRUCTED TO TAXI TO RWY 19R AT INTXN V. APCHING INTXN V; WHILE ON TXWY E; GND CTL SWITCHED US TO TWR FREQ. AS SOON AS WE SWITCHED TO TWR FREQ; TWR ASKED US IF WE COULD TAKE IT ON THE ROLL. WE SAID WE COULD. TWR SAID 'TURN TO HDG 210 DEGS; CLRED FOR TKOF RWY 19R AT INTXN V.' WE BEGAN THE ROLL AND TOOK OFF. AS WE APCHED THE INTXN OF RWYS 19R AND 7R; WE SPOTTED A B757 IN THE AIR CLBING OUT OF RWY 7R. WE LEVELED OFF AND PASSED RIGHT BELOW THE B757. APPARENTLY; MKE TWR CLRED BOTH ACFT FOR TKOF ABOUT THE SAME TIME ON DIFFERENT RWYS AND RESULTED IN AN NMAC. MKE TWR APOLOGIZED FOR THE SIT OVER THE FREQ. IN RETROSPECT; THE B757 WAS CLRED FOR TKOF WHILE WE WERE ON THE GND FREQ. THAT IS WHY WE WERE NOT AWARE OF THEM. ALSO; FROM OUR RWY; YOU CANNOT SEE THE BEGINNING OF THE OTHER RWY BECAUSE THE TERMINALS ARE IN THE WAY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: B190 CAPT ADVISED THAT AT ONE POINT HE WAS JUST 50 FT AIRBORNE; LEVELING OFF; AND CONCERNED THAT IF HE COULDN'T START WHEEL RETRACTION SOON; THE CREW WOULD 'HAVE OTHER PRESSING ACTIVITIES TO WORRY ABOUT.' THE FLC HAS NOT HEARD ANY RESPONSE FROM COMPANY. SUPPLEMENTAL INFO FROM ACN 558073: WE WERE CLRED FOR TKOF ON RWY 7R IN MKE. AS WE PASSED RWY 19R INTXN (WE WERE APPROX 500 FT AGL) WE SAW A COMMUTER AIRPLANE HEADING TOWARDS US THAT WAS TAKING OFF ON RWY 19R. NO EVASIVE MANEUVERS WERE REQUIRED BY US. WE ESTIMATED THE OTHER AIRPLANE TO BE 1500 FT OFF TO OUR L. THE TWR CTLR VERIFIED THAT WE WERE IN FACT CLRED FOR TKOF AND APOLOGIZED FOR THE ERROR OF CLRING THE COMMUTER AIRPLANE FOR TKOF AFTER US (ON THE INTERSECTING RWY). CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE B757 CAPT ADVISED THAT THERE WAS JUST ENOUGH TIME TO SEE THE B190 XING BELOW THEIR ACFT. THE CAPT ADVISED THAT THEY 'COULD NOT REACT FAST ENOUGH' TO MAKE AN EVASIVE MANEUVER. THE FLC HAS NOT HEARD ANY RESPONSE FROM COMPANY.