Remove a StorageValue

[yolfran]

I have a question,
.
How can i remove a StorageValue or change for other

I need for mi VIP system ,I have a storage value and when the vip ends I want change the value or remove it,but I dont know.

I was trying something like this:

function onLogin(cid)
local premStorage = 35966
        if isVip(cid) == TRUE and getPlayerStorageValue(cid,premStorage)== -1 then
                setPlayerStorageValue(cid, premStorage, 1)
        elseif isVip(cid) == FALSE and getPlayerStorageValue(cid, premStorage) == 1 then
                setPlayerStorageValue(cid, premStorage, -1)
        elseif isVip(cid) == FALSE and getPlayerStorageValue(cid, premStorage) == 1 and getPlayerVocation(cid) > 4 then
                doPlayerSetVocation(cid, getPlayerVocation(cid) -4)
                end
        return TRUE
end

onlogin,I have the funcition Isvip in the lib ,and the code in creaturescripts,but i cant change the storage.

 

[SpiderOT]

function onLogin(cid)
local premStorage = 35966
        if getPlayerVipDays(cid) >= 1 then
		setPlayerStorageValue(cid, premStorage, 1)
		doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, "welcome vip")
		else
		doPlayerSendTextMessage(cid, MESSAGE_INFO_DESCR, "Sorry, but only VIP Players can pass here! Buy VIP on the Site.")
		setPlayerStorageValue(cid, premStorage, -1)
		end
		return true
end