4 (1-oz.) squares unsweetened baking chocolate  | 
                                                1 cup butter or margarine  | 
                                                1 1/2 cups sugar  | 
                                                4 eggs  | 
                                                2 teaspoons vanilla extract  | 
                                                2 cups all-purpose flour  | 
                                                2 (1-oz.) squares unsweetened baking chocolate  | 
                                                1/4 cup butter or margarine  | 
                                                1/4 cup milk  | 
                                                2 teaspoons vanilla extract  | 
                                                3 cups powdered sugar, sifted  |