appear and disappear a plane

hello again bothering
I need to appear and dessappear an object without collider ,keys or the mouse

#pragma strict

var minTime = 1.0;
var maxTime = 2.0;

function Start() { 
	Invoke("ShowHideDrops", Random.Range(minTime, maxTime));
}

function ShowHideDrops() {
	renderer.enabled = !renderer.enabled;
	Invoke("ShowHideDrops", Random.Range(minTime, maxTime));
}

Attach this script to a plane. It will how/hide the plane every 1.0 to 2.0 seconds.