AN A-1 HUSKEY PLT TAXIED ACROSS THE ACTIVE RWY AT LCI IN FRONT OF AN ACFT ON TKOF ROLL.

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WHILE TAXIING FOR DEP ON RWY 26 AT LACONIA MUNICIPAL ARPT I CROSSED THE PATH OF A DEPARTING C152. IT WAS A MORNING DEP FROM AN UNFAMILIAR ARPT. I TAXIED FOR DEP IN THE OPPOSITE DIRECTION OF AN ACFT INBOUND FOR THE PARKING RAMP. FROM THE RAMP I TAXIED E ON THE TXWY; THEN S ON A CLOSED RWY PERPENDICULAR TO RWY 26. DURING TAXI I MONITORED THE CTAF AND WAS AWARE OF OTHER RPTING TFC. UPON REACHING THE XING INTXN I GLANCED AT THE DEP AREA; AND SEEING NOTHING; PROCEEDED TO CROSS THE RWY. A DEPARTING C152 PASSED OVERHEAD AS WE EXITED THE RWY ONTO THE PARALLEL TXWY. A SECOND PLT WAS A PAX IN THE BACK SEAT. AS WE CROSSED RWY 26 HE POINTED OUT THE APCHING AIRPLANE. I WAS ABLE TO CLR THE RWY AS HE PASSED OVERHEAD. THERE WAS AN ACFT RPTING ON DOWNWIND. I CROSSED THE RWY QUICKLY TO AVOID A POTENTIAL CONFLICT WITH THE KNOWN TFC. THE C152 WAS NOT ANNOUNCING ON THE CTAF AT ANYTIME BEFORE; DURING OR AFTER THE EVENT. ITS LNDG AND STROBE LIGHTS (IF ANY) WERE OFF. THE DARK BLUE COLOR OF THE C152 BLENDED INTO THE BACKGROUND AT THE DEP END OF THE 5286 FT RWY. MY QUICK GLANCE WAS INADEQUATE TO IDENT THE AIRPLANE. STOPPING TO REALLY LOOK AT THE DEP END WOULD HAVE BEEN THE APPROPRIATE PROC. MY PERCEPTION WAS THAT I WAS AWARE OF ALL TFC BASED ON MONITORING THE CTAF. I FAILED TO EXERCISE GOOD JUDGEMENT IN NOT STOPPING AND CAREFULLY SURVEYING THE DEP END OF THE RWY BEFORE XING IT. THE DECISION TO RUSH ACROSS THE RWY IN ANTICIPATION OF LNDG TFC WAS ILL ADVISED. THE ARPT WAS NOT PARTICULARLY BUSY. THE ANNOUNCEMENTS ON THE CTAF LULLED ME INTO BELIEVING THAT I WAS AWARE OF ALL TFC. I WAS TOO COMPLACENT ABOUT REALLY LOOKING FOR UNEXPECTED TFC.