Need a system

[dimasa3]

Hi. Could any1 please create a system that works like this:

Weapons= lvl 1 items
Armors=lvl 2 items
Shields (offhand)=lvl 3 items

So...

A unit is only allowed to have 1 item of lvl 1,2 and 3. If he allready have an item of that level he drops the second picked up item and a message is displayed:

Picks up a weapon (lvl 1): "You allready have a weapon"

Picks up an armor (lvl 2): "You are allready wearing an armor"

Picks up an offhand item (like a torch or a shield) (lvl 3): "You allready have an offhand item"