Script Problems

var explosionTime = 1.0;

function Start () {

 var explosionPosition = transform.position;
 var colliders : Collider[] = Physics.OverlapSphere (explosionPosition, explosionRadius);

 for (var hit in colliders) {
     if (!hit)
         continue;

     if (hit.rigidbody) {
         hit.rigidbody.AddExplosionForce(explosionPower, explosionPosition, explosionRadius, 3.0);

         var closestPoint = hit.rigidbody.ClosestPointOnBounds(explosionPosition);
         var distance = Vector3.Distance(closestPoint, explosionPosition);

         // The hit points we apply fall decrease with distance from the hit point
         var hitPoints = 1.0 - Mathf.Clamp01(distance / explosionRadius);
         hitPoints *= explosionDamage;

         // Tell the rigidbody or any other script attached to the hit object 
         // how much damage is to be applied!
                 // I modified This part of the code. 
         hit.gameObject.player.SendMessageUpwards("ApplyDamage", hitPoints, SendMessageOptions.DontRequireReceiver);
         hit.rigidbody.SendMessageUpwards("ApplyDamage", hitPoints, SendMessageOptions.DontRequireReceiver);

     }


 }

 // stop emitting ?
 if (particleEmitter) {
     particleEmitter.emit = true;
     yield WaitForSeconds(0.5);
     particleEmitter.emit = false;
 }

 // destroy the explosion
 Destroy (gameObject, explosionTime);