RAPID CITY, SD—In spite of winning an $18-million Powerball jackpot in 1998, William Berringer, 39, insisted on returning to his line-cook job at Nelson's Steak House Tuesday. "Winning all that money didn't change me," Berringer said. "I'm still the same Bill Berringer that I was before I hit the jackpot, then proceeded to spend it all on partying, bad stocks, and a Jamaican condominium." Berringer added that he hopes everyone at work will treat him the same way they always did, or at least the ones who were there when he quit his job the day after he won the jackpot.