Problem with First Person Shooter Script

Hey All! I am generating a query in which a player will fire at the enemy, upon which, for each fire the health of the enemy will be reduced by 10. In case the value of health is less than or equal to zero the enemy will be destroyed. But on compilation it gives the following error:

Assets/Scripts/Gun.js(44,67): BCE0019: 'health' is not a member of 'UnityEngine.Component'.

Funcion behind the gun:

function fire() { var range = Mathf.Infinity;
var ray = Camera.main.ScreenPointToRay(Input.mousePosition); var hit : RaycastHit;

 if(Physics.Raycast(ray , hit, range))
 {
     sparks.transform.position = hit.point;
     if(hit.transform.gameObject.tag == "enemy")
     {
         hit.transform.GetComponent("enemyHealth").health -= damage;     
     }
 }

}

Function behind the enemy:

var health : float = 100; // But the variable health is declared and also it is // being shown, for the enemy, in the inspector > script inside unity function Update() { if(health <= 0) { Destroy(gameObject); } }