After coming within a whisker of a fresh eight-year high yesterday, the market ended the holiday-shortened trading week on a negative note, falling for the first day in five, down 5.44 points, or 0.8%, to 669.19. The 665 level, which held as a technical resistance level for a couple weeks before last Friday's breakout, may now serve as support as a dip to 664 at the low of the session in the afternoon was quickly reversed.