The episode which originally aired on December 17, 2004  was written by whom?
CREATE TABLE "table1_228973_11" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text
);
SELECT "written_by" FROM "table1_228973_11" WHERE "original_air_date"='December 17, 2004';