Countdown con effetto sonoro

[Nefyt]

Posto uno script fatto tanto per esercitazione che gestisce un countdown fatto da giorni/ore/minuti/secondi con un effetto sonoro funzionante correttamente solo su chrome, puo sempre essere fonte di spunto

pagina.html

<script src="timer_s.js"></script>
<div id="timer" style="margin-top:20%;font-family:Arial,Helvetica,sans-serif;text-align:center;font-size:30px;"></div>

<script>
   
   timer.CallTimer(
   new Array(2,4,34,20),
   document.getElementById('timer'),
   'clock.mp3',
   'MyCallBackFunction()'
);
    
    function MyCallBackFunction(){ alert('Finish'); }
   
</script>

timer_s.js

/*
 * Sound Timer
 */

var timer = {
    
    times : null,
    div : null,
    sound: null,
    func: null,
    Stop: false,
    
    CallTimer: function(time,div,sound,func){
        this.times = time;
        this.checkSet();
        this.div = div ? div : null;
        this.sound = sound ? sound : null;
        this.func = func ? func : null;
        this.StartTimer();
   },
   
   checkSet: function(){
       for(i=0;i<4;i++)
         this.times[i] = typeof this.times[i] === 'number' ? parseInt(this.times[i]) : 0;
   },
   
   StartTimer: function(){
       this.SpawnTextAndSound();
       this.checkStatus();
       if(!this.Stop)
       setTimeout('timer.StartTimer()',1000);
   },
   
   SpawnTextAndSound : function(){
       this.div.innerHTML = this.times[0]+' : '+this.times[1]+' : '+this.times[2]+' : '+this.times[3]+'<embed src=\''+this.sound+'\' hidden=true autostart=true>';
   },
   
   checkStatus : function(){
       if(this.times[3]==0 && this.times[2]==0 && this.times[1]==0 && this.times[0]==0){ setTimeout(this.func,0); this.Stop = true; }
       
       else if(this.times[3]==0 && this.times[2]>0){ this.times[3]=60; this.times[2]--; }
       else if(this.times[3]==0 && this.times[2]==0 && this.times[1]>0){ this.times[3]=60; this.times[2]=59; this.times[1]--; }
       else if(this.times[3]==0 && this.times[2]==0 && this.times[1]==0 && this.times[0]>0){ this.times[3]=60; this.times[2]=59; this.times[1]=24; this.times[0]--; }
       else this.times[3]--; 
   }
}