AN APTOS MAN WAS ARRESTED ON GUN CHARGES FOLLOWING A CARJACKING ATTEMPT IN LIVE OAK YESTERDAY AFTERNOON (TUES).    OFFICIALS SAY A WATSONVILLE TEEN WAS IN THE PARKING LOT OF SIMPKINS FAMILY SWIM CENTER WHEN HE WAS APPROACHED BY 20-YEAR-OLD MICHAEL IRELAND.    IRELAND HELD THE TEEN AT GUNPOINT AND DEMANDED HE GIVE UP HIS CAR.      AFTER THE VICTIM REFUSED, IRELAND FLED THE SCENE IN A JETTA.    DEPUTIES FOUND THE SUSPECT NEAR 17TH AND SOQUEL AVENUES SHORTLY AFTER.     IRELAND WAS BOOKED INTO SANTA CRUZ COUNTY JAIL.