The Sensex at the Bombay Stock Exchange gained 112 points, or 0.6 percent, to 18,766 in early trade, today, on continued buying by investors, amid firm Asian markets. But disappointing quarterly results by IT major, Wipro pushed the Sensex into negative territory in mid-morning deals. So after falling more than 100 points at one stage, the Sensex stood 84 points, or 0.5 percent in the negative zone, at 18,570, in volatile trade, a short while ago. Other markets in Japan, Hong Kong, Indonesia, Singapore, South Korea and Taiwan were up by between 0.1 percent and 2.1 percent, today. Over in the US, the key Dow Jones Industrial Average had surged 1.6 percent, overnight, after strong corporate results, and renewed hope for an agreement in Washington on thorny budget issues boosted investor confidence.