minute:second (3:00)
<span id="d2" style="font-size: 28px; color: blue; font-weight: bold;"> </span>
<script>
var seconds=180;
function display(){
timeleft=""+seconds % 60;
if (timeleft.length == 1) timeleft="0"+timeleft;
timeleft = Math.floor(seconds / 60) +":"+ timeleft;
document.getElementById("d2").innerHTML=timeleft;
if (seconds>0){
seconds-=1;
setTimeout("display()",1000);
}
}
display()
</script>