GLOBAL MARKETS-Dollar hits 1-month high as periphery woes weigh on Europe

* Peripheral yields up on Greek, Spanish uncertainty * Euro tumbles, European stocks fall * Dollar hits eight-year peak above 122 yen * Commodities knocked by dollar strength * Investors await U.S. data later in session By Marc Jones LONDON, May 26 (Reuters) - Greece's financial crisis and signs of growing opposition to austerity in Spain sent the euro to its lowest level in a month on Tuesday, while shares and commodities took a knock as the dollar powered higher. E