GLOBAL MARKETS-Dollar firm as Syria action on hold, oil eases

* Dollar hovers near 4-week high on upbeat U.S. data * Oil falls as Britain says no to Syria action * World shares set to end week and month lower * Emerging currencies steadier, set for big monthly losses By Richard Hubbard LONDON, Aug 30 (Reuters) - Signs of strength in the U.S. economy kept the dollar near a four-week high against major currencies on Friday, while oil prices fell on ebbing prospects of an imminent U.S.-led military strike against Syria. Global equitie