When the F button is pressed, replace the Idle animation with another?

local enabled = true
local player = game.Players.LocalPlayer
local Service = game:GetService("UserInputService")
local Character = player.Character or player.CharacterAdded:Wait()

Service.InputBegan:connect(function(input, gameProcessedEvent)
	if not gameProcessedEvent then
		if input.UserInputType == Enum.UserInputType.Keyboard then
			if input.KeyCode == Enum.KeyCode.F then	
				if enabled == true then
			    wait(.5)
				enabled = false
				player.PlayerScripts.QQ.Disabled = true
				    local animation = Instance.new("Animation")
    animation.Parent = player.Character.Humanoid
    animation.AnimationId = "http://www.roblox.com/Asset?ID=03789053986"
    local animTrack = player.Character.Humanoid:LoadAnimation(animation) 
    animTrack:Play()
				elseif enabled == false then
				player.PlayerScripts.QQ.Disabled = false
				wait(1)
				enabled = true
				end
			end
		end
end
end)