Jackie Chan, the Hong Kong action film star known for his daredevil stunts, was named a goodwill ambassador Monday for the United Nations Children's Fund and the Joint United Nations Programme on HIV/AIDS. The actor will help fight the spread of HIV and discrimination against those affected by it as well as advance the causes of children, particularly those who suffer through armed conflict, said Rodney Hatfield, UNICEF's representative in Cambodia. "Let me know whatever I can do, wherever I can go. I promise you I'll do it," said Chan. Chan will visit children with AIDS and tour land mine rehabilitation centers during his three-day stay in Cambodia, which ends Wednesday. "We are confident that Jackie's prestige, great talent, and genuine concern for children will help the United Nations send a powerful message on the impact of HIV/AIDS and conflict on children that will reach the hearts and minds of people throughout the world," Hatfield said.