Erasing all its initial gains, the Sensex at the Bombay Stock Exchange stood 90 points, or 0.4 percent in negative territory, at 20,697 in afternoon trade, a short while ago, amid continued selling by foreign funds. Earlier in the morning, however, the Sensex had gained 76 points, or 0.4 per cent to 20,863. Stock markets in China, Japan, Indonesia, Taiwan, Hong Kong, Singapore and South Korea were trading mixed, today. Wall Street's Dow Jones Industrial Average had lost 0.3 percent in yesterday's trade.