Lua gamemode help!

[CTxD]

Gmod lua help!

It may sound simple, but i can't wrap my head around it!

I made a Derma with a button. I want the button to decrease my money ----SERVER SIDE---- and not clientside!

How do i do this? Please respond.

Some of my code --------------->
function.lua

include( 'level_system.lua' )
include( 'class.lua' )

function AddLevelPlayer(ply)
ply:TakeMoney(100)
print("Added")
end
concommand.Add("add" , AddLevelPlayer)

------------------>
money_system.lua

local meta = FindMetaTable("Player")

function meta:AddMoney(amount)
local current_cash = self:GetMoney()
self:SetMoney( current_cash + amount )
end

function meta:SetMoney(amount)
self:SetNetworkedInt( "Money", amount )
self:SaveMoney()
end

function meta:SaveMoney()
local cash = self:GetMoney()
self:SetPData("money", cash)
end

function meta:SaveMoneyTXT()
file.Write(gmod.GetGamemode().Name .."/Money/".. string.gsub(self:SteamID(), ":", "_") ..".txt", self:GetMoneyString())
end

function meta:TakeMoney(amount)
self:AddMoney(-amount)
end

function meta:GetMoney()
return self:GetNetworkedInt( "Money" )
end

------------------>
menu.lua

local hey = FindMetaTable( "Player" )

include( 'shared.lua' )
include( 'money_system.lua' )
include( 'level_system.lua' )
include( 'class.lua' )
include( 'function.lua' )

function ClassMenu()
local ply = LocalPlayer()

local Frame = vgui.Create( "DFrame" )
Frame:SetPos( 200, 200 )
Frame:SetSize( 450,400 )
Frame:SetTitle( "Choose Class: " )
Frame:SetVisible( true )
Frame:SetDraggable( true )
Frame:ShowCloseButton( true )
Frame:MakePopup()

local Combo = vgui.Create("DComboBox", Frame)
Combo:SetPos( 10,35 )
Combo:SetSize(100, 35)
Combo:AddChoice( "Starter" )
Combo:AddChoice( "Beginner" )

local Slid = vgui.Create( "DNumSlider", Frame )
Slid:SetPos( 25,150 )
Slid:SetSize( 150, 100 )
Slid:SetText( "Skill count:" )
Slid:SetMin( 1 )
Slid:SetMax( 100 )
Slid:SetValue( 1 )
Slid:SetDecimals( 0 )

local But = vgui.Create( "DButton", Frame )
But:SetText( "Buy Skill Level" )
But:SetPos( 25, 100 )
But:SetSize( 150, 50 )
But.DoClick = function()
hey:ConCommand("add")
end
end

--------------->
As you can see i made a console command "add", wich should play the function called AddLevelPlayer in the function.lua... It did not work.

Hope to get an answer!
Thanks in advance!

[Gravity_]

Instead of hey:ConCommand("add") do RunConsoleCommand("add")

[CTxD]

It takes some of my money, but they are returned after some time..

[editline]17th December 2012[/editline]

Fixed it somehow, thanks anyway!