Why won't this work?

TeleGUI = game.Workspace.TG.TalkGUI
function
wait (20)
game.Workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = 0
wait(0.5)
game.Workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = 0.1
wait(0.5)
game.Workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = 0.2
wait(0.5)
game.Workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = 0.3
wait(0.5)
game.Workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = 0.4
wait(0.5)
game.Workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = 0.5
wait(0.5)
game.Workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = 0.6
wait(0.5)
game.Workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = 0.7
wait(0.5)
game.Workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = 0.8
wait(0.5)
game.Workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = 0.9
wait(0.5)
TeleGUI.Parent:Remove()
end

There are a few mistakes here.

1) - You need to name your function, then add the parameter holders ' () '.

2) - You need to either connect your function to an event or call it somewhere.

Efficiency edits;

1) - You can use a numerical for loop, rather than resetting the value over and over and over

2) - The remove() method is deprecated, use the Destroy() method.

local TeleGUI = game.Workspace.TG.TalkGUI

function fade()
	wait (20)
	for i = 0,1,.1 do
		workspace.TeleportGUI.TalkGUI.Frame.BackgroundTransparency = i
		wait(0.5)
	end
	TeleGUI.Parent:Destroy()
end