FRANKFURT (MarketWatch) -- The U.S. dollar fell sharply against most of its major rivals on Tuesday, as commodity prices and global equities posted gains. The dollar index (DXY 77.47, -0.56, -0.72%) tumbled to an intraday low of 77.398. The index, which measures the greenback against a basket of six major currencies, fell to 77.474 in recent trading from 77.893 on Monday. The British pound rose 1% to $1.6509 and the euro gained 0.6% to $1.4418. The dollar fell 0.7% to 92.31 Japanese yen. The sharp dollar weakness propelled gold futures above the psychologically key level of $1,000 an ounce
