GUITimer

private var textMesh:TextMesh;
var textTime : String;

private var startTime;
private var restSeconds : int;
private var roundedRestSeconds : int;
private var displaySeconds : int;
private var displayMinutes : int;

var countDownSeconds : int;

function Start() {
    startTime = Time.time;
    textMesh = GetComponent(TextMesh);
}

function Update () {

    var guiTime = Time.time - startTime;
    restSeconds = countDownSeconds - (guiTime);

    if (restSeconds == 0) {
        if(Time.timeScale == 1.0){
            Time.timeScale = 0.0;
        }
    }
    if (Time.timeScale == 0.0){
        if(Input.GetButtonDown("load")){
            Application.LoadLevel(0);
            Time.timeScale = 1.0;
        }
    }


    roundedRestSeconds = Mathf.CeilToInt(restSeconds);
    displaySeconds = roundedRestSeconds % 60;
    displayMinutes = roundedRestSeconds / 60;

    textTime = String.Format ("{0:00}:{1:00}", displayMinutes, displaySeconds);
    textMesh.text = textTime;
}