lua script <help plz>

[7i7a]

Hello all
iam looking for an lua script {action}
that work as the following :-
if i have an itemid 3031 and use it then the item with id removed (3031)
and new item add to my backpack another id
with a magic effect (ill edit myself)
Thx

 

[Seminari]

function onUse(cid, item, fromPosition, itemEx, toPosition)

doRemoveItem(item.uid)
doPlayerAddItem(cid, newitemid, count)
doSendMagicEffect(fromPosition, CONST_ME_HITAREA)

return true
end