button = script.Parent
blue = button.BackgroundColor3
red = Color3.new(1,0,0)
green = Color3.new(0,1,0)

function changeColor()
 if button.BackgroundColor3 == blue then
 button.BackgroundColor3 = red
 elseif button.BackgroundColor3 == red then
 button.BackgroundColor3 = green
 else
 button.BackgroundColor3 = blue
 end
end

button.MouseButton1Click:connect(changeC­olor)