You know those coming attractions that are supposed to be approved for viewing by all ages? Starting June 1, the Motion Picture Association of America began quietly applying the same standards to Internet Web sites created to promote movies.\nAccording to the association, everything that goes up on a movie's official Website has to be G-rated. It's not a new rating system, an association spokesman said. It's a guideline for advertising and marketing.\n At the insistence of theater owners, studios submit their movies to the association for a rating. At the time, the studio also submits the advertising and promotion that will be used. Beginning in June, those advertising and promotion materials had to include Website content.\n The rule is not retroactive. As a result, movies submitted before June may continue to have Websites with material too racy to earn a G rating. In addition, the association won't do anything about movie Websites set up by fans or the sites of unrated films or foreign sites.\n That creates a loophole as big as a wide screen. The most popular films and entertainers are often the subject of dozens of Websites. Any of those sites, including "fan" sites unofficially set up by the studios themselves, can get away with content that might not have earned a G rating.\n For example, Universal Studios created a site (www.BASEketball.net) in connection with its new comedy, "BASEketball". Meanwhile, though, it has allowed an unregulated fan site to spring up at www.BASEKETBALL.com. In this particular instance, both film and site were submitted before June 1 and were thus exempt from Website regulation. But it demonstrates the difficulty the association will have controlling Websites, as opposed to coming attractions.