Numpad Feature Help

[eNergizer]

Alright so I basically want to add a numpad feature to this addon: [url]http://www.garrysmod.org/downloads/?a=view&id=42593[/url]

The addon makes NPCs do an animation when you shoot them with a toolgun and I think it's annoying to have a toolgun beam shooting at an NPC in your recording. So I want to build a numpad feature for it. Here's the code so far, I was playing around with it.

TOOL.Category		= "Poser"
TOOL.Name			= "#NPC Scene"
TOOL.Command		= nil
TOOL.ConfigName		= ""
TOOL.ClientConVar["name"] = "scenes/npc/Gman/gman_intro"
TOOL.ClientConVar["actor"] = "Alyx"
TOOL.ClientConVar["SelectedNpc2"] = "1"
local SelectedNpc = 1

if (CLIENT) then
	local SceneList = {}
	local function ParseDir(t, name, ext)
		for k,v in pairs(file.Find("../"..name.."*"..ext)) do
			local n = t:AddNode(string.gsub(v, ".vcd", ""))
			n.MyLabelThing = name..string.gsub(v, ".vcd", "")
			n.DoClick = function(self)
				RunConsoleCommand("npc_scene_name", self.MyLabelThing)
			end
		end
		for k,v in pairs(file.FindDir("../"..name.."*")) do
			local n = t:AddNode(v)
			ParseDir(n, name..v.."/", ext)
			n:SetExpanded(false)
		end
	end
	SceneListPanel = vgui.Create("DFrame")
			SceneListPanel:SetSize			(300,	750	)
			SceneListPanel:SetPos			(100,	100	)
			SceneListPanel:SetVisible		(false		)
			SceneListPanel:SetDeleteOnClose	(false		)
			SceneListPanel:SetTitle			("Scenes"	)
				local ctrl = vgui.Create("DTree", SceneListPanel)
						ctrl:SetPadding(5)
						ctrl:SetSize	(300,	725	)
						ctrl:SetPos		(0,		25	)
					local node = ctrl:AddNode("Scenes! (click one to select)")
						ParseDir(node, "scenes/", ".vcd")
	language.Add( "Tool_npc_scene_name", "NPC Scene" )
	language.Add( "Tool_npc_scene_desc", "Make NPCs act!" )
	language.Add( "Tool_npc_scene_0", "Left click to play entered scene, right to set the actor name." )
	function ListScenes()
		SceneListPanel:SetVisible(true)
		SceneListPanel:MakePopup()
	end concommand.Add("npc_scene_list", ListScenes)
	function TOOL.BuildCPanel(CPanel)
		CPanel:AddControl("Header", {Text = "#NPC Scene", Description = "NPC Scenes"})
		CPanel:AddControl("TextBox", {
			Label = "Scene Name",
			Command = "npc_scene_name",
			MaxLength = 500
		})
		CPanel:AddControl("Button", {
			Text = "List Scenes",
			Name = "List Scenes",
			Command = "npc_scene_list"
		})	
		CPanel:AddControl("TextBox", {
			Label = "Actor Name",
			Command = "npc_scene_actor",
			MaxLength = 500
		})
		
		CPanel:AddControl( "Numpad", {	Label	= "Animation", Command  = "animation_start", ButtonSize = 22 } )
		
	end
	

	end
	

function TOOL:LeftClick(tr)
	if tr.Hit and tr.Entity and tr.Entity:IsValid() and tr.Entity:IsNPC() then
				SelectedNpc = tr.Entity
		return true
	end
end

function TOOL:RightClick(tr)
	if tr.Hit and tr.Entity and tr.Entity:IsValid() and tr.Entity:IsNPC() then
			if SERVER then
				tr.Entity:SetName(self:GetClientInfo("actor"))
			end
		return true
	end
end

function TOOL:Think( )
	-- numpad.Register( "animation_start", 	function()
		-- if SERVER then
			-- SelectedNpc:PlayScene(string.gsub(self:GetClientInfo("name"), ".vcd", ""))
		-- end
	-- end );
	function blah()
		print("WORKS")
	end
	
		numpad.Register( "animation_start", blah  )
end

Well I added a Cpanel: CPanel:AddControl( "Numpad", { Label = "Animation", Command = "animation_start", ButtonSize = 22 } )

And I want that numkey to start a function, and I have no idea where to put it under

So I made a numpad.Register( "animation_start", blah ) in function TOOL:Think( )
Where should I properly place it? Also the compiler is saying that numpad.Register( "animation_start", blah ) is giving a nil value. The function blah has no errors so I don't know why the numpad is giving a nil.

Here's the error:
weapons\gmod_tool\stools/npc_scene.lua:97: attempt to index global 'numpad' (a nil value)

[editline]05:37PM[/editline]

Ok well I added a change to get rid of the error:

	if SERVER then
		function blah()
			print("WORKS!")
		end
		numpad.Register( "animation_start", blah  )
	end

Had to make it under if SERVER.

So now I get this error when I push the key:
Unknown command: animation_start