Hackers or crackers. Or in this case quakers. Whatever you call them, one of them broke into the Lost World Web site with the mission of turning the image of a threatening T-Rex into a duck. Universal Pictures, which runs the site, said the hacker didn't totally fowl up the site--the duck image was only up from about 3 a.m. to 8 a.m. Wednesday morning. "Any time you have a break in your firewall you have to take it seriously," said Universal Pictures spokesman Alan Sutton. "But it's important to maintain perspective."