RONKONKOMA - Police say they seized $5,000 worth of fireworks in Ronkonkoma yesterday and have arrested the man who tried to sell them.According to investigators, air traffic controller Kenneth Felser bought more than 30 cartons of fireworks in Maryland and recklessly stored the explosives in his garage on Carl Street, just two blocks away from Ronkonkoma Elementary School."The fireworks in the garage were next to a 5-gallon can of gas that had gasoline in it, as well as a 2- or 3-gallon can of gasoline," says Suffolk County District Attorney Thomas Spota.Felser, 31, is expected to be arraigned next month.