Sensex whizzes past 18K in 789-point rallyBS Reporter / Mumbai October 9, 2007The Sensex opened with a negative gap of 89 points at 17,402, and dropped to a low of 17,287 in morning deals. The index moved into positive zone soon on the back of fresh buying in select stocks. As buying spread to other counters, the index began to move to higher levels. And then the mood turned...Frenzied buying in the last hour of trade saw the index zoom to a new all-time intra-day high of 18,327 - up 1,040 points from the day's low. BIG GAINS