script Problem

i got this script attached to the water object:
// Destroy everything that enters the trigger

var healthRad : float;

function OnTriggerEnter (other : Collider) {
	var healthRad - 1;
	if(healthRad < 1)
	Destroy(other.gameObject);
}

and it shows that error:
Assets/WaterContact.js(5,30): UCE0001: ‘;’ expected. Insert a semicolon at the end.

whats wrong?
Play4FreedomDE

More like this?

var healthRad : float;
function OnTriggerEnter (other : Collider) {
var healthRad - 1;
if(healthRad < 1){
	Destroy(other.gameObject);
 }