L2W NPC Audio Detect Script

[patch]

Hi,
Does anyone know how to make a L2walker Script for alert on found NPC?

There's a PS I play on with a random spawn NPC, and other then using the map and searching for it all day.. I'd like to have just a audio file play when it's inrange.. then i'll know of it.
as i use IG, and dont like playing in window mode.:/