Help making basic health bar script

i am having problems making my health bar its very basic and but im a noob. I wouldn’t be surprised if i have done something horrible wrong and blindingly obvious .
so here is my code:
#pragma strict
static var Health : int = 100;
var HealthNow = 100;
var pos = transform.position;
// Use this for initialization
function Start () {

	// Update is called once per frame
	function Update () {
		if(Health < HealthNow);
	     pos.x + 1;
     	 transform.position = pos;
		 var HealthNow = Health;

my error is
Assets/health.js(14,20): BCE0034: Expressions in statements must only be executed for their side-effects.

The error is warning you about the ‘;’ at the end of line 5. It terminates the ‘if’ so that everything from line 6 to 10 line is executed every frame. Remove the ‘;’ from the end of line 5.