Need NPC that sets storage

[arturhaddad]

I need a NPC that only talks to who has storage 9345.
Also it will set storage 9345 if player gives him a "comb" (id: 5946).

I have the script in the point that NPC doesn't talk to who hasn't storage 9345, and talks normally to who has storage 9345:

local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)

function onCreatureAppear(cid)			npcHandler:onCreatureAppear(cid)			end
function onCreatureDisappear(cid)		npcHandler:onCreatureDisappear(cid)			end
function onCreatureSay(cid, type, msg)		npcHandler:onCreatureSay(cid, type, msg)		end
function onThink()				npcHandler:onThink()					end

npcHandler:addModule(FocusModule:new())

function greetCallback(cid)
if (getPlayerStorageValue(cid,9345) == 1) then
		return true
	end
	npcHandler:say('To talk with me you must find my {comb}.', cid)
end
npcHandler:setCallback(CALLBACK_GREET, greetCallback)

Now i need to add the function that allows the npc set storage to who gives him the comb.

Help please,
thanks