What is wrong with my on/off button test I made for my game?

I'm trying to make an on/off object with only one button. I've made a little test which does the following:

• The first time you click it, it changes the brickcolor of a part called ''on''. Then it changes the color of the button itself.

• The second time you click it, it's supposed to change the brickcolor of a part called ''off''.

I've made this little test to understand how to script an on/off button. But It won't work.

Here's my script.

if
	script.Parent.Parent.testbutton.BrickColor = Color3(255, 0, 0)
	then
		script.Parent.ClickDetector.MouseClick:Connect(function()
			script.Parent.Parent.on.BrickColor = Color3.new(0, 255, 255)
			script.Parent.Parent.testbutton.BrickColor = Color3.new(0, 255, 0)
			elseif
				script.Parent.Parent.testbutton.BrickColor = Color3(0, 255, 0)
				then
					script.Parent.Parent.off.BrickColor = Color3.new(0, 255, 255)
				end
		end)
	end

On = Part 1 Off = Part 2

I would really like some help! Thank you in advance.

I formated your code a bit. But I'm not sure it will run. Try it

if script.Parent.Parent.testbutton.BrickColor == Color3(255, 0, 0) then
        script.Parent.ClickDetector.MouseClick:Connect(function()
            script.Parent.Parent.on.BrickColor = Color3.new(0, 255, 255)
            script.Parent.Parent.testbutton.BrickColor = Color3.new(0, 255, 0) 
	end)

elseif script.Parent.Parent.testbutton.BrickColor == Color3(0, 255, 0) then
	script.Parent.Parent.off.BrickColor = Color3.new(0, 255, 255)
       
end