Preheat your oven's broiler, and grease a broiling pan, or line with aluminum foil. In a small bowl, mix together the Parmesan cheese, butter, mayonnaise, and lemon juice and season with dried basil, pepper, onion powder, and celery salt, mix well and set aside. Arrange fillets in a single layer on the prepared pan. Broil a few inches from the heat for 2 to 3 minutes. Flip the fillets over, and broil for a couple more minutes. Remove the fillets from the oven, and cover them with the Parmesan cheese mixture on the top side and broil for 2 more minutes, or until the topping is browned, and fish flakes easily with a fork. Be careful not to over cook the fish.