A rally in Reliance Industries helped the Bombay Stock Exchange index, Sensex, end in positive zone during the week ended September 14.Reliance gained nearly 4% to close at Rs 2,034 after hitting a historic high of Rs 2,069 on government's approval of its gas pricing formula.However, fierce opposition to the Indo-US nuclear deal by the Left, fears of US economic recession precipitated by the subprime crisis, worries over the mortgage problem in UK and a steep fall in industrial production added uncertainty to the market.Foreign institutional investors (FIIs) remained net buyers during the week, and have invested close to $1 one billion this month, which provided the required buffer to the market.The Sensex swung between a high of 15,825 (a mere 44 points away from its all-time, intra-day high of 15,869) and a low of 15,363 before concluding the week at 15,604, - a net gain of 14 points over the last weekend close of 15,590.The broad-based S&P CNX Nifty of the National Stock Exchange (NSE) moved up nine points to 4518 from the last weekend close of 4509.