Slice bread, but not all the way through, leaving slices attached at the bottom. In a small bowl, cream butter. Add the Parmesan cheese, parsley, garlic, oregano and garlic salt; mix well. Spread between slices. Wrap loaf in a large piece of heavy-duty foil (about 28 in. x 18 in.). Bake at 325° for 15-20 minutes or until heated through.