CREATE TABLE table_24262 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT, "U.S. viewers  ( millions ) " TEXT)

Who wrote the episodes directed by David Straiton?
SELECT "Written by" FROM table_24262 WHERE "Directed by" = 'David Straiton'
SELECT "Written by" FROM "table_24262" WHERE "Directed by" = 'David Straiton'