var colorStart : Color = Color.red;
var colorEnd : Color = Color.green;
var elapsed: float = 0.0;
var fadingIn: bool = false;

function Update () {
	if (gameObject.renderer.enabled == false) {
		fadeingIn = true;
		return;
	}
	renderer.material.color = Color.Lerp (colorStart, colorEnd, elapsed);

	if (fadingIn == true) {
		elapsed += Time.deltaTime;
		if (elapsed > 1.0) {
			fadeIn = false;
		}
	}
	else { // fadeingIn == false  (i.e. fading out)
		elapsed -= Time.deltaTime;
		if (elapsed < 0.0) {
			// done
			gameObject.renderer.enabled = false;
		}
	}
}