Giving up all its initial gains, the Sensex at the Bombay Stock Exchange stood 65 points, or 0.3 percent in negative territory, at 20,360 in afternoon trade, a short while ago. But earlier in the morning, the Sensex had gained 34 points, or 0.2 per cent, to 20,459, on fresh buying by funds and retail investors.Stock markets in China, Indonesia, South Korea, Hong Kong and Taiwan had climbed between 0.