1.Preheat The Oven To 375 Degrees F (175 Degrees C). 2.Grease A Baking Sheet With Cooking Spray. Place The Tilapia Fillets On The Sheet, And Coat Them Lightly With Cooking Spray. Spoon The Melted Margarine Over Each Fillet, Then Drizzle With 2 Tablespoons Of Lemon Juice. Season With Lemon Pepper And 2 Tablespoons Of Dill. 3.Bake For 15 Minutes In The Preheated Oven, Or Until The Fish Is Opaque And Flakes Easily. 4.While The Fish Is Baking, Combine The Cream Cheese, 5 Tablespoons Of Lemon Juice And 2 Tablespoons Of Dill In A Small Bowl. Heat In The Microwave For 1 Minute And 10 Seconds, Then Stir To Blend. 5.Place Fillets Onto Serving Plates, And Spoon Sauce Around Them In A Decorative Fashion.