// code

	if (Input.GetMouseButton(0)) {
//	if (Input.GetMouseButtonDown(0)) {
	Debug.Log ("MOUSE DOWN!");
	GUI.contentColor = Color.red;
}

if (Input.GetMouseButtonUp (0)) {
	Debug.Log ("MOUSE UP!");
//	more code
}


void Update () {
	if (Input.GetMouseButtonDown(0)) {
		print ("Mouse Button Down !");
	}
}