Franco-Belgian bank Dexia new Chief Executive Pierre Mariani (R) and Chairman Jean-Luc Dehaene leave a news conference at the bank's headquarters in Brussels, October 7, 2008. A new chief executive and chairman took over at Dexia on Tuesday, but the battered shares of the world's biggest lender to municipalities resumed their downward path due to uncertainty over its future. REUTERS/Francois Lenoir (BELGIUM)