Drain pineapple, save juice and add water to make 2 cups. In saucepan melt butter and add celery, onion, and saute 2-3 minutes. Stir in brown sugar and corn starch. Remove from heat and stir in soy sauce, worcestershire sauce and 2 cups liquid. Cook over medium heat, stirring constantly until thick. Add pineapple chunks, pour over chicken and bake 1 hour 15 minutes (uncovered) in 375 degree oven.