Unable to build on the momentum of Tuesday's big rally, major stock-market averages are selling off sharply at the open in New York. The Dow Industrials are off 240, or 2%, the Nasdaq Composite shed 62, or 2.6%, and the S&P 500 dropped 20, or 1.7%.More headlines from FoxBusiness.com:http://email.foxnews.com/t?ctl=12A05:7469D46E31DAE9CA0151A456504DFA44&--------------------------------------------