What is wrong here?

I have the following code, but the Text will not change!!! Help?

while script.Parent.Parent.Visible == true do
    v = math.random(10,15)
    script.Parent.Style = "Custom"
    script.Parent.TextColor3 = Color3.new(0,0,0)
    repeat
        script.Parent.Text = ""..v..""
        v = v-1
        wait(1)
    until v == 0
    script.Parent.Style = "RobloxButtonDefault"
    script.Parent.TextColor3 = Color3.new(255,255,255)
    script.Parent.Text = "Click to Close Advertisement"
    script.Parent.MouseButton1Click:connect(function ()
        script.Parent.Parent.Visible = false
    end)
    wait()
end

There's no output given by Studio...