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

I understand that an answer has already being accepted but would like to throw in my 2c: I like to avoid extra coding whenever possible. Using Jonathan Lonowski's approach, I would improve it like:

var interval = setInterval(function() {
    var timer = $('span').html().split(':');
    //by parsing integer, I avoid all extra string processing
    var minutes = parseInt(timer[0],10);
    var seconds = parseInt(timer[1],10);
    --seconds;
    minutes = (seconds < 0) ? --minutes : minutes;
    if (minutes < 0) clearInterval(interval);
    seconds = (seconds < 0) ? 59 : seconds;
    seconds = (seconds < 10) ? '0' + seconds : seconds;
    minutes = (minutes < 10) ?  '0' + minutes : minutes;
    $('span').html(minutes + ':' + seconds);
}, 1000);