javascript/jquery countdown timer with JSfiddle example?

Question

I am building a few things and one of them is a countdown timer, the countdown will never be over an hour so all I need to do is countdown minutes and seconds.

I have it

Answer 1

setInterval returns an identity you can use later to clearInterval:

var interval = setInterval(function() {
    /* snip */
    $('span').html(minutes + ':' + seconds);

    if (parseInt(minutes, 10) == 0 && parseInt(seconds, 10) == 0)
        clearInterval(interval);
}, 1000);

And, to avoid the ever-increasing minutes -- 00000001:42 -- either:

1. change length.minutes to minutes.length in your prefix test.
2. cast the values to Numbers when retrieving -- var minutes = parseInt(timer[0], 10); -- and just test if (minutes < 10) ....

Taking option #2, here's an update: http://jsfiddle.net/BH8q9/