Opening/closing door has bugs, can anyone help?

I have three parts to a door. One is a union, and the other two are regular parts. I put this script inside the union in hopes of making the union and the other two parts disappear when the union was clicked... but, it doesn't work. I don't know what I did wrong.

h = script.Parent.Parent.Handle
k = script.Parent.Parent.Knob
u = script.Parent

function onclicked()
	if h.Transparency == 0 and k.Transparency == 0 and u.Transparency == 0 and h.CanCollide == true and k.CanCollide == true and u.CanCollide == true then
		h.Transparency = 1
		k.Transparency = 1
		u.Transparency = 1
		h.CanCollide = false
		k.CanCollide = false
		u.CanCollide = false
	else
		h.Transparency = 0
		k.Transparency = 0
		u.Transparency = 0
		h.CanCollide = true
		k.CanCollide = true
		u.CanCollide = true
	end
end

script.Parent.ClickDetector.MouseClick:connect(onclicked)

If anyone could tell me what I did incorrectly, that would be awesome.