Countdown Timer

function duration(time) {
    var buffer  = '';
    var chunks  = new Array();
    var hours   = Math.floor((time / 3600));
    time %= 3600;
    var minutes =  Math.floor((time / 60));
    time %= 60;

    if(hours > 0) { chunks.push(hours + ' hour' + ((hours == 1)?'':'s'));}
    if(minutes > 0) { chunks.push(minutes + ' minute' + ((minutes == 1)?' ':'s'));}
    if(time > 0) { chunks.push(time + ' second' + ((time == 1)?'':'s'));}

    var len = chunks.length;
    for(var i = 0; i < len; i++) {
        switch(true) {
            case i == len-1:
                buffer += chunks[i];
                break;
            case i == len-2:
                buffer += chunks[i] + ' and ';
                break;
            default:
                buffer += chunks[i] + ', ';
                break;
        }
    }
    return buffer;
}