Preheat oven to 350 degrees. Grease a small casserole dish with butter. Melt the 1/2 stick of butter, add the saltines, the flour and the milk, stir well. Beat the eggs, and then add to the cracker mixture. Add the creamed corn, stir well, and pour into casserole dish. Bake at 350 degrees for 90 minutes, or until a toothpick comes out clean when inserted in the middle of the casserole.