Random with percentages

[fault]

I am looking for randoms with percentages. IE you turn in an item to an npc and he randomly gives you items where som elesser items are a greator chance then major items.


Source quest I am trying to write up: http://everquest.allakhazam.com/db/quest.html?quest=604

He randomly gives you 3 items, one is very common, the second is medium-rare the 3rd is a rareity.