&$ &$A man is silhouetted in front of a stock index board outside a brokerage in Tokyo January 22, 2010. The benchmark Nikkei average slid 2.7 percent and the broader TOPIX fell 1.9 percent on Friday. (Xinhua/Reuters Photo)&$ &$ Japan's Nikkei Stock Average slumped 2.56 percent on Friday following a U.S. government proposal to impose tougher regulations on banks to reduce risk taking. The news ...