Time Counter

Hello,
i've got a Problem with my time counter in my game.

var textTime : String; function Start () {

}

function Update () {

var Crono = Time.time;
var minutos : int = Crono / 60; var segundos: int = Crono % 60; var milesimas: int = (Crono * 100)% 100; textTime = String.Format ("Time:{0:00}:{1:00}:{2:00}", minutos, segundos, milesimas); GetComponent(GUIText).text = textTime.ToString();

}

This is my Timer and it works perfect but the Problem is, if i won the Level or switch to another level it just goes on from my last Level so if i Finish a level it does stop but go on on the other level.
Thanks

 

Code (csharp):

1.  
2. var speed:float;
3.  
4. function Start()
5. {
6. Crono = 0;
7. }
8.  
9.  
10. function Update()
11. {
12. Crono +=  Time.deltaTime;
13. }
14.  

 

Thanks works great!