Opening credits: "Loser's Lane --- the sidewalk in front of Mindy's Restaurant on Broadway-- is not as high-toned a trading center as Wall Street, but the brokers are a lot more colorful. Generally they prefer to put their money on a prizefight or horserace, but when the action slows, anything can happen and it usually does. Tonight, for example, the citizens of the Lane are discussing the latest contest in their usual quiet way --"