Wild, wild laughs, adventure and special-effectswizardry abound when megastarWill Smith reteamswith the director of "Men in Black." Smith is agentJames West, leading sidekick Artemus Gordon (Kevin Kline)and a sexy adventuress (Salma Hayek) on a perilousassignment: stop Dr. Arliss Loveless (Kenneth Branagh)and his contraption-driven plot to establish a DisunitedStates of America.