[Javascript] milliseconds to time string

function fnMsToTime(duration) {
    var milliseconds = parseInt((duration%1000)/100)
        , seconds = parseInt((duration/1000)%60)
        , minutes = parseInt((duration/(1000*60))%60)
        , hours = parseInt((duration/(1000*60*60))%24)
        , days = parseInt(duration/(1000*60*60*24));
    hours = (hours < 10) ? "0" + hours : hours;    minutes = (minutes < 10) ? "0" + minutes : minutes;    seconds = (seconds < 10) ? "0" + seconds : seconds;
    return days + "일 " + hours + "시간 " + minutes + "분 " + seconds + "초 " + milliseconds + ' 남음';}