Elation, dejection switch dugouts at ballpark;BASEBALL

If any of the Giants or their fans forgot what itfeels like to ride a crazy wave of emotion, like the one they wereriding a year ago, all he or she had to do was check out theDiamondbacks on Sunday. Two hours before the game when the Arizonans took the field fortheir stretching session, they didn't saunter or jog to centerfield. They burst forth from their dugout, whooping and prancinglike young colts in the late-morning fog.