Particle on and off

Hi, I have a chest that opens and closes with OnTrigger , I would put a particle emitter in the chest, and just turn it on when the chest is opened. Here is the script I'm using, I would like someone help him. Thank you.

 var AngleX : float = 0.0;    
 var AngleY : float = 0.0;    
 var AngleZ : float = 0.0;  
 
 private var targetValue : float = 0.0;    
 private var currentValue : float = 0.0;    
 private var easing : float = 0.1;  
 
 var Target : GameObject
 
 function Update () {    
     currentValue = currentValue + (targetValue - currentValue) * easing;
 
     Target.transform.rotation = Quaternion.identity;    
     Target.transform.Rotate (0 , 0, currentValue);        
 }
 
 function OnTriggerEnter (other : Collider) {        
     targetValue = AngleX;    
     currentValue = 0.0;    
 }
 
 function OnTriggerExit (other : Collider) {    
     currentValue = AngleX;    
     targetValue = 0.0;    
 }