Asian markets opened sharply higher today after a good day on Wall Street, when U.S. stocks gained back a good part of he sell-off on Monday. Major indexes in Seoul and Sydney were up about 3 percent shortly after the opening. Tokyo's Nikkei was almost 2 percent higher.U.S. markets swung wildly back and forth between sharp gains and deep drops during a nerve-wracking day on Wall Street yesterday. The Dow Jones Industrial Average wound up the day 4 percent higher.