Server Hook function? is it correct?

[Pieterkii]

So im trying to teleport someone back to tanaris when they leave tanaris, this script seems fine?
though it says "attempt to index global 'player'". Pleas can anyone help me?

function GetNewZone(event, Player, ZoneId, OldZoneId)
if ( Zoneid ~= 440 ) then
player:KickPlayer(0)
player:Teleport(1, -11660.05, -4719.92, 60.52, 4.32)
end
end

RegisterServerHook(15, "GetNewZone")