Kicking off a new crackdown on drunken driving in New York City, police officers seized the cars of three drivers late Sunday and yesterday -- including one from a Staten Island librarian with no prior arrests and another from a 57-year-old Queens man with a long record of driving while intoxicated. The seizures came as Mayor Rudolph W. Giuliani hinted at how tough the crackdown might be, saying that even those ultimately acquitted of drunken driving in criminal court could still face the prospect of losing their cars through proceedings in civil courts. "Let's say somebody is acquitted, and it's...