function onThink(interval)
for _, cid in ipairs(getPlayersOnline()) do
if getPlayerSlotItem(cid, CONST_SLOT_RIGHT).itemid == YOURWEAPONID or getPlayerSlotItem(cid, CONST_SLOT_LEFT).itemid == YOURWEAPONID then
doSendMagicEffect(getCreaturePosition(cid), 65)
end
end
return true
end