Help With Enemy Health Bar

Hello! I am trying to make a enemy health bar that displays the amount of health the enemy has; after I kill it, the bar should display 0. I need some help to display this. My script won’t work. Could you please help me write a script that displays this. Here is my current script:

#pragma strict

function OnGUI()
{

	var box = GUI.Box(Rect(20,20,200,30),"First Enemy Health: " + EnemyHealth.Health);
	var boxTwo = GUI.Box(Rect(20,20,200,30),"First Enemy Health: 0");
	return box;
	if (EnemyHealth.Health <= 0)
	{
		return boxTwo;
	}
}

function ApplyDammage(TheDammage :int)
{
	EnemyHealth.Health -= TheDammage;
}

This script calls from another script called Enemy Health. Here is this script:

#pragma strict

static var Health = 100;

function Update () {

	if (Health <= 0)
	{
		Destroy (gameObject);	
	}
}

function ApplyDammage(TheDammage :int)
{
	Health -= TheDammage;
}

Anyone, can you please help me.

Your returning box no matter what, so it never get’s past there to get to return box2.