Java Script: Clock script help.

Hello, I was wondering if anyone could help me on this! I have this clock script and i want it to play a sound and play animations on multiple objects when it hits zero. Help?

 #pragma strict
 
 var timer : float = 10.0;
 
 function Update () 
 {
     timer -= Time.deltaTime;
     
     if(timer <= 0)
     {
         timer = 0;
         
     }
 }
 
 function OnGUI ()
 {
     GUI.Box(new Rect(10,10,50, 20), "" + timer.ToString("0"));
 }