The former president and chief operating officer of Coca-Cola Co., Jack Stahl, is to take over as the CEO at the ailing cosmetics group, Revlon.  He will be the company's third chief executive in five years. Stahl, 48, resigned from Coke in March 2001 after a management re-shuffle. He was said to be looking for CEO position, a role that would not be available to him at Coke for some time.