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.