Christmas Rainbow Cake
["1 (2 layer size) pkg. white cake mix", "1 (3 oz.) pkg. raspberry gelatin", "1 (3 oz.) pkg. lime gelatin", "2 c. boiling water", "1 (9 oz.) container Cool Whip, thawed"]
["Prepare cake mix as directed on package, baking in 2 well-greased and floured 9-inch layer pans at 350\u00b0 for 25 to 30 minutes.", "Cool in pans 15 minutes.", "Poke with fork at 1/2-inch intervals.", "Do not remove from pans."]
["layer", "raspberry gelatin", "lime gelatin", "boiling water"]