Gains in the opening bell in select heavyweights, tech, cement and pharma majors lifted the index above the 6,600 mark. The Sensex is now firm at 6,617 - up 39 points, while the Nifty has moved up 13 points over its yesterday's close at 2,076.Infosys has opened strong with a gain of 1.17% (Rs 24) at Rs 2,068. While Reliance has added Rs 3 to Rs 545, ITC is up a notch at Rs 1,330.ONGC is up Rs 3 at Rs 821. Wipro and Satyam are up a per cent each at Rs 691 and Rs 405, respectively.Ranbaxy has gained 1.37% (Rs 14) to Rs 1,058. Other pharma stocks have also commenced in the green with steady gains.ACC is up a per cent (Rs 3) at Rs 383. Grasim and Gujarat Ambuja have added steady gains at Rs 1,354 and Rs 455, respectively.HLL, which is to come up with its Q4 & FY04 numbers today, is down a rupee at Rs 153.Bharti has edged lower in the opening trades and has shed 2% (Rs 4) to Rs 205.