For the sixth time in seven sessions, the Nasdaq lost ground, and the indexes fell further under their 200-day moving averages. The Nasdaq shaved off 0.3%, the S&P 500 0.2% and the NYSE composite 0.1%. The IBD 50 dropped 0.9%. Volume fell across the board from Wednesday's totals. Although the losses in the major indexes were not dramatic Thursday, the action was disturbing on a couple of levels. First, it was hard to find any broad investment