GUI sprites Not showing even with no errors in the script, Help ?

My script right here :

while true do
script.Parent.Image="http://www.roblox.com/asset/?id=3212229767"
wait(0.09)
script.Parent.Image="http://www.roblox.com/asset/?id=3212229994"
wait(0.09)
script.Parent.Image="http://www.roblox.com/asset/?id=3212230152"
wait(0.09)
script.Parent.Image="http://www.roblox.com/asset/?id=3212230316"
wait(0.09)
script.Parent.Image="http://www.roblox.com/asset/?id=3212230545"
wait(0.09)
script.Parent.Image="http://www.roblox.com/asset/?id=3212230698"
wait(0.09)
script.Parent.Image="http://www.roblox.com/asset/?id=3212230841"
wait(0.09)
script.Parent.Image="http://www.roblox.com/asset/?id=3212230972"
wait(0.09)
end

is supposed to make an animated Billboard GUI ,I used a template then made it for GUI, it worked, and then when i slammed my sprites on it, it does not show the images.

Someone can help me ?

Also, the sprites were verified.