How To Call Health Script From Another Script ?

hello
i have An Empty gameobject i added health bar script to it
as u can see in the picture
it is called ( HealthBar )

#pragma strict
public var health : float; // var helath
var texture1: Texture2D; // texture 2d
var mat : Material; // material
var x : float = 0;
var y : float = 0;
var w : float;
var h : float;
function Start () {
health = 1000; // begining health is 100
}
function OnGUI(){
if(Event.current.type.Equals(EventType.Repaint)){ //Is the game being drawn?
var box : Rect = new Rect(x, y, w, h); // the postion of the drawn on screen
Graphics.DrawTexture(box, texture1, mat);  // you draw the bo and texture2d and material
}
}
function Update () {
var healthy : float = 1-(health/100);
if(healthy == 0){
 
 
 
healthy =.1;
}
mat.SetFloat("_Cutoff", healthy);
 
if ( health <= 0 )
{
 
GameOver() ;
}
 
 
}
 
 
 
function GameOver ()
{
 
 
Application.LoadLevel("GameOver") ;
}
function AddHealth ()
{
health +=30 ;
}

and that is the code of HealthBar Script
this Script Called ( HelathBar1)
what i want is
to make the health Float Increase By ( 30)
if a cube hit a bullet

the problem that
when the bullet hit the cube nothing happen
first i want to ask ?
where should be the script who call the health bar script on ?
on bullet or on the cube ?
secound how to call the health bar and increase the health of it by ( 30 )
and that is my trying
but it is not working

#pragma strict
private var player : GameObject  ;
 
private var   HealthScript  :  HealthBar1 ;
 
 
function Start () {
//var  HealthScObject = GameObject.FindGameObjectWithTag ("Player");
//if (HealthScObject != null)
//        {
//            HealthScript  =  HealthScObject.GetComponent ("HelthBar1");
//        }
//        if (HealthScript == null)
//        {
//            Debug.Log ("Cannot find 'GameController' script");
//        }
 
 
}
 
 
function OnTriggerEnter (other : Collider)
{
if ( other.gameObject.tag == "Player")
{
 
other.GetComponent(HealthBar1).health += 30 ;
 
 
 
}
 
 
}

it is increase the health by ( 30 )
when it is Hit the HealthBar Empty Object who have the script (HealthBar1 )

if added Health bar script to the bullet it is working also
so what should i do to call it with out added it to the bullet
hope you help me

Generally speaking the code needs to do something like this… (C# version)

SomeClass sc = GameObject.Find("ObjectWithSomeClass").GetComponent<SomeClass>();

sc.SomeMethod();