OAKLAND — The Lakers played a fine first quarter tonight against the Golden State Warriors, but they went off the rails in the second and trailed by halftime. After outscoring the Warriors, 23-14, and holding them to 24.1 percent shooting (7 of 29) in the opening quarter, the Lakers lost their momentum. The Warriors outscored them, 29-15, in the second quarter. Kobe Bryant scored 10 points of his 11 points in the first quarter. Monta Ellis scored 10 of his 14 points in the second for the Warriors.