Stocks posted their highs in the first minutes of trade Monday and then slid the rest of the session. The Nasdaq fell 0.3% after being up as much as 0.5%. The S&P 500 dropped 0.5% while the NYSE composite slid 0.4%. The small-cap Russell 2000 edged down less than 0.2%. Volume was down on both major exchanges. The chart action was generally negative. The Nasdaq and the S&P 500 were both turned south after trying to retake their 50-day moving