send message object variable

I am trying to send a variable with an object (var del = this.Gameobject;) to another script.

What I have is:
var hitPoints : float = 50.0;
var sound : AudioClip;
var del = this.Gameobject;

function OnTriggerEnter (other : Collider) { 
	if (other.CompareTag ("Player")){
		other.SendMessageUpwards("Medic", hitPoints, SendMessageOptions.DontRequireReceiver);
		other.SendMessageUpwards("Del", del, SendMessageOptions.DontRequireReceiver);
		AudioSource.PlayClipAtPoint(sound, transform.position);

for sending the message, and:

public void Medic (float hitPoints) {
 if (currentHp > 250.0)

	public void Del (GameObject del) {

for receiving
The problem is I get this error when running the game:

Failed to call function Del of class PlayerDamage Calling function Del with no parameters but the function requires 1. UnityEngine.Component:SendMessageUpwards(String, Object, SendMessageOptions) Medic:OnTriggerEnter(Collider) (at Assets/Resources/NewScripts/Medic.js:8)

You probably already saw the first script is js and the second c#
public void Medic does work correctly, only the Del void gets an error

It would be great if someone could help me

GameObject : The GameObject class.

gameObject : The gameObject your script is attached to.

You have to use

var del = this.gameobject;