//the total time for the timer to run (Since it's a public variable, the timer can be changed in unity via the inspector).
    public var totalTime:int = 180;

    //the curent time of the timer
    private var currentTime:int = 180;

    //the GUIText Component the time will be written to
    private var timerText:GUIText;

    //Whether the timer is running or not
    private var running:boolean = true;

    public var numberOfSeconds:int = 0;

    function Start()
    {
    currentTime = totalTime;
    timerText.enabled = true;

    //retrieve the GUIText Component
    timerText = gameObject.GetComponent(GUIText);

    //assign the totalTime to the textfield of the GUIText
    timerText.text = totalTime.ToString();

    //call TimerTick to start the timer ticking
    TimerTick();
    }
    /**
        Function to tick the timer by 1 second and update the text
    */
    function TimerTick()
    {
        // use a while loop to create a controlled infinite loop
        while (running)
        {
            // cause a delay of 1 second within the script
            yield WaitForSeconds (1);

            //increments the time by 1 second
            numberOfSeconds++;

            // reduce the current time
            currentTime--;

            // assign the currentTime to the textfield of the GUIText
             timerText.text = currentTime.ToString();

            // if timer runs out (i.e. currentTime == 0) stop the loop
             if (currentTime ==0){
            // Application.LoadLevel("menu");
            timerText.text = ("GAME OVER");

            break;
        }
      }
    }
    function addTime(seconds:int)
    {
    currentTime+=seconds;
    }