**** It helps to have seen 20,000 movies or at least have the pure instincts of a child to grasp the degree of excitement director James Cameron has restored to an industry that had lost its sense of showmanship except when making movies about dinosaurs, aliens, and spaceships. Kate Winslet, up for one of the epic's 14 Oscar nods, co-creates one of the screen's most all-around attractive characters in years. And history's first billion-dollar movie gives today's audiences and inkling of what it was like to experience The Ten Commandments in the '50s and Spartacus in the 60s. (PG-13: disaster-related perial and violence, nudity, sensuality and brief language) - M.C.