After opening with a positive gap of 32 points at 12,917, the index moved a up a bit before slipping into the negative zone to touch a low of 12,872, only to renbound later.The index is now up 82 points at 12,967.Grasim and Tata Motors have advanced around 1.5% each to Rs 2,100 and Rs 766, respectively.Hindalco, Bajaj Auto and BHEL have gained around 1% each to Rs 130, Rs 2,515 and Rs 2,117, respectively.Reliance Communications has slipped 2.3% to Rs 413.