npc that trades item for an item

[Triggah]

as the title says i need a script for an npc that trades item for item.

can anyone help?

or send me a sample npc that does this

 

[luckeeeee]

<?xml version="1.0"?>
    <npc name="addonitem buyer" script="data/npc/scripts/addonitem.lua" access="3" lookdir="2" walkinterval="2000">
    <mana now="800" max="800"/>
    <health now="200" max="200"/>
    <look type="133" head="121" body="49" legs="69" feet="26"/>
<parameters>
        <parameter key="module_shop" value="1" />
        <parameter key="message_greet" value="Hello |PLAYERNAME|. I buy addon items." />
        <parameter key="shop_sellable" value="sniper gloves,5875,200;lizard leather,5876,10;green dragon leather,5877,7;minotaur leather,5878,15;giant spider silk,5879,9;iron ore,5880,15;lizard scale,5881,20;red dragon leather,5882,11;ape fur,5883,16;spool of yarn,5886,6;piece of royal steel,5887,2000;piece of hell steel,5888,4500;piece of draconian steel,5889,8000;chicken feather,5890,12;enchanted chicken wing,5891,20;perfect behemoth fang,5893,15;behemoth fang,5893,15;bat wing,5894,20;fish fin,5895,200;bear paw,5896,21;wolf paw,5897,9;beholder eye,5898,25;turtle shell,5899,20;dwarven beard,5900,2000;honeycomb,5902,30;magic sulphur,5904,200;vampire dust,5905,150;demon dust,5906,400;dragon claw,5919,500;green dragon scale,5920,10;behemoth claw,5930,600;icicle,4848,750;red dragon scale,7314,25;white piece of cloth,5909,20;green piece of cloth,5910,20;red piece of cloth,5911,20;blue piece of cloth,5912,20;brown piece of cloth,5913,20;yellow piece of cloth,5914,20;red dragon leather,5948,15;demon horn,5954,20;tortoise egg,6125,30;hydra egg,4850,50;phoenix egg,2328,200;" />
</parameters>

</npc>

here you got a simple script only change (name,id,price)



Plz Rip++ ME

 

[Triggah]

thats the npc.xml, i need a script (lua)