A CORRALITOS TEENAGER HAS BEEN HOSPITALIZED FOLLOWING A HIT AND RUN YESTERDAY (MON).    THE 15-YEAR-OLD WAS RIDING HIS BICYCLE ON DAY VALLEY ROAD WHEN HE WAS STRUCK BY A GREEN PICK-UP TRUCK.     THE DRIVER STOPPED BRIEFLY BEFORE FLEEING THE SCENE.    THE VICTIM SUFFERED MAJOR INJURIES AND WAS TRANSPORTED TO A TRAUMA CENTER IN SAN JOSE.     C-H-P OFFICERS ARE STILL LOOKING FOR THE VEHICLE AND DRIVER RESPONSIBLE.