The Sensex at the Bombay Stock Exchange jumped 181 points, or 1 per cent, to 18,761 in opening trade, this morning, on fresh buying by investors, amid firm global markets. Later, after surging as much as 290 points at one stage, the Sensex pared its gains, but still stood a good 200 points, or 1.1 percent in the green, at 18,780 in afternoon deals, a short while ago. All the sectoral indices were trading higher.Key stock indices in China, Hong Kong, Indonesia, Singapore and South Korea were up between 0.1 percent and 1 percent, today, as expectations that economic reform and budget plans unveiled by Spain may pave the way for a bailout, buoyed investor sentiment.The US Dow Jones Industrial Average had gained 0.5 per cent in yesterday's trade.