Coca-Cola Steak

1 1/2 pound boneless round steak, in 4 pieces
1 tablespoon flour
1 cup onion, chopped
1/2 teaspoon salt
1/8 teaspoon garlic salt
1/8 teaspoon pepper
1/4 cup ketchup
1/2 cup Coca Cola

Dredge steak in flour and add to crockpot with other ingredients. Cover and cook 4 to 5 hours on HIGH, or 8 to 10 hours on LOW.