How do I add a game over screen on my Javascript?

So I have a Javascript for my player's health, the problem is when the character "dies", it goes on a blank screen, and I have to manually shut down the game. I want to set it up so that when I die it says game over. Here's my script, I had to put the () between the number sign because it would be bold without it.:

(#)pragma strict

var Health = 100;

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

 if(Health <= 0)
 {
     Dead();
 }

}

function Dead() { Destroy (gameObject); }