Here's the script I use:
PHP:
local rewards = {4330, 4334}
rand = math.random(#rewards)
function onKill(cid,target)
if isPlayer(target) == TRUE then
item = doPlayerAddItem(cid,rewards[rand],1)
if getPlayerSex(target) == 0 then
sex = "She"
else
sex = "He"
end
doSetItemSpecialDescription(item,"This is the "..getItemName(rewards[rand]).." of "..getPlayerName(target).." at level "..getPlayerLevel(target)..". "..sex.." was killed by "..getPlayerName(cid).." at level "..getPlayerLevel(cid)..".")
end
end