S.Korea won falls to 2-year low; shares hold steady

By Yeawon Choi SEOUL, July 21 (Reuters) - The South Korean won slid to a two-year low on Tuesday on offshore dollar demand, mirroring the stronger dollar after a top Federal Reserve official added to expectations that U.S. interest rates could be raised as early as September. The won was down 0.5 percent at 1,157.9 on the dollar as of 0239 GMT after falling as low as 1,158.9, the weakest since June 25, 2013. "The won could extend losses as market participants are betting on possibil