Lua Help with Buy-With-Click script

[Mozkysl]

Hi, I need help with one script so when I click on an item(in this case holes -1512) I can buy backpacks of potions.
I actually use this script I found on TFS 0.3.4.

local config = {
effect = 39,
aolPrice = 4000
}
local prices = {
--[runeId] = {cost, charges, backpackColor, count},
--POTIONS--
[7618] = {800, 1, "red", 20}, --health potion
[7620] = {900, 1, "purple", 20}, --mana potion
[7588] = {1800, 1, "red", 20}, --strong health potion
[7589] = {1500, 1, "purple", 20}, --strong mana potion
[7591] = {3500, 1, "red", 20}, --great health potion
[7590] = {2200, 1, "purple", 20}, --great mana potion
[8472] = {3500, 1, "yellow", 20}, --great spirit potion
[8473] = {5800, 1, "red", 20}, --ultimate health potion
--RUNES--
[2273] = {3300, 1, "blue", 1}, --UH
[2268] = {6600, 3, "grey", 1}, --SD
[2313] = {4700, 6, "purple", 1}, --explosion
[2287] = {600, 10, "green", 1}, --light magic missile
[2311] = {2200, 10, "purple", 1}, --heavy magic missile
[2304] = {3400, 4, "red", 1}, --great fireball
[2302] = {1800, 5, "red", 1}, --fireball
[2265] = {1800, 1, "grey", 1}, --IH
[2261] = {800, 3, "grey", 1}, --destroy field
[2316] = {7300, 1, "purple", 1}, --animate dead
[2262] = {6500, 2, "grey", 1}, --energy bomb
[2277] = {2200, 3, "blue", 1}, --energy field
[2315] = {2800, 4, "purple", 1}, --thunderstorm
[2274] = {3400, 4, "blue", 1}, --avalanche
[2271] = {2900, 5, "blue", 1}, --icile
[2308] = {4000, 3, "red", 1}, --soulfire
[2285] = {1200, 3, "green", 1}, --poison field
[2286] = {3200, 2, "green", 1}, --poison bomb
[2289] = {4000, 4, "green", 1}, --poison wall
[2290] = {1500, 1, "green", 1}, --convince creature
[2291] = {4000, 1, "green", 1}, --chameleon
[2292] = {2200, 10, "green", 1}, --stalagmite
[2288] = {2800, 4, "green", 1}, --stone shower
[2301] = {1600, 3, "red", 1}, --fire field
[2305] = {4400, 2, "red", 1}, --firebomb
[2303] = {4600, 4, "red", 1} --fire wall
}
-----
function onUse(cid, item, fromPosition, itemEx, toPosition)

local function backpackIdByName(name)
local backpacksId = {["green"]=1998, ["yellow"]=1999, ["red"]=2000, ["purple"]=2001, ["blue"]=2002, ["grey"]=2003, ["golden"]=2004}
    return backpacksId[name] or LUA_ERROR

end

local aid = item.actionid - 10000

    if aid == 2173 then
        if (doPlayerBuyItem(cid, 2173, 1, config.aolPrice, 1)) ~= LUA_ERROR then
            doPlayerSendTextMessage(cid, MESSAGE_EVENT_ORANGE, "You've bought an amulet of loss.")
            doSendMagicEffect(getCreaturePosition(cid), config.effect)
        else
            doPlayerSendTextMessage(cid, MESSAGE_EVENT_ORANGE, "You don't have enough money. The price is "..config.aolPrice.." gold pieces.")
        end

    else

                if (doPlayerBuyItemContainer(cid, backpackIdByName(prices[aid][3]), aid, 1, prices[aid][1], prices[aid][2])) == LUA_NO_ERROR then
                    doPlayerSendTextMessage(cid, MESSAGE_EVENT_ORANGE, "You've bought a backpack of "..getItemNameById(aid)..".")
                    doSendMagicEffect(getCreaturePosition(cid), config.effect)
                else
                    doPlayerSendTextMessage(cid, MESSAGE_EVENT_ORANGE, "You don't have enough money. The price is "..prices[aid][1].." gold pieces.")
                end
    end
    return TRUE
end

and I add to actions.xml this

	<action uniqueid="7618" event="script" value="comprar.lua"/>
	<action uniqueid="7620" event="script" value="comprar.lua"/>
	<action uniqueid="7588" event="script" value="comprar.lua"/>
	<action uniqueid="7589" event="script" value="comprar.lua"/>
	<action uniqueid="7591" event="script" value="comprar.lua"/>
	<action uniqueid="7590" event="script" value="comprar.lua"/>
	<action uniqueid="8472" event="script" value="comprar.lua"/>
	<action uniqueid="8473" event="script" value="comprar.lua"/>

Whats wrong :huh: please help a noob in problems