E145 FLC CONCERNED WITH HPN COMMENTS AFTER AIRBORNE WHEN TWR ADVISES INBOUND ACFT ARPT CLOSED. TWR ADVISED DEPARTING FLC THAT DEPARTED WAS AT PLT'S DISCRETION.

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AT APPROX XA30 ON DEC/XA/99; WE TAXIED TO RWY 34 AT HPN (WHITE PLAINS/WESTCHESTER COUNTY). THE RWY EDGE LIGHTS WERE OTS; HOWEVER; THE CTRLINE LIGHTS WERE FULL BRIGHT AND IT WAS STILL DAYLIGHT. THE TWR ADVISED US HE WAS NOT ISSUING ANY TKOF CLRNCS AND THAT 'TKOF AT OUR OWN RISK.' I REQUESTED CLARIFICATION AND ASKED IF THAT MEANT THE FIELD WAS UNCTLED AND WE COULD DEPART. HE RESPONDED 'NEGATIVE; THE FIELD IS CTLED. TAKE OFF AT YOUR OWN RISK; ADVISE IF ROLLING.' THE CAPT AND I DISCUSSED THIS AND BOTH AGREED THAT WE WERE CLRED FOR TKOF AT OUR OWN DISCRETION. AFTER DEP; WE HEARD THE TWR ADVISE AN INBOUND ACFT TO 'HOLD OVER THE BRIDGE; THE FIELD IS CLOSED.' I'M AFRAID WE MAY HAVE DEPARTED A CLOSED ARPT AND ENTERED CLASS B AIRSPACE WITHOUT A CLRNC. SEVERAL FACTORS LED TO OUR DECISION TO DEPART. FIRST; THE CTLR WAS UNCLR ON OUR CLRNC. WHEN WE REQUESTED CLARIFICATION; HE WAS HOSTILE AND UNHELPFUL. A SECOND FACTOR WAS OUR DESIRE TO LAUNCH BEFORE DUSK; SO WE WOULD NOT BE STUCK IN HPN FOR THE NIGHT. I FEEL THAT THIS PROB MAY BE AVOIDED IN THE NEAR FUTURE IF WE REQUEST FURTHER CLARIFICATION FROM THE TWR. IF THEY ARE UNWILLING TO CLARIFY; WE MUST REFUSE TO DEPART UNTIL WE'RE CLRLY RELEASED.