How to get the minutes start back at 00 in count Up Timer

Question

Hi am working on this Count Up/Count down Timer however I can't get the minutes to return back to 00 after an hour has elapsed (or reach 60).

The 60 remains and it just continues counting the minutes (e.g. 1:61:09).

I would like it to show (e.g. 1:01:09)

$(document).ready(function() {

jQuery.fn.countUpDown = function(settings,to) {
    settings = jQuery.extend({
    startFontSize: '12px',
    endFontSize: '12px',
    duration: 1000,
    direction: 'down',
    startNumber: 10,
    endNumber: 0,
    callBack: function() { }
    }, settings);
    return this.each(function() {

        //where do we start?
        if(!to && to != settings.endNumber) { to = settings.startNumber; }

            hours = Math.floor(to / 3600);
            minutes = Math.floor(to / 60);
            seconds = Math.round(to % 60);
                if (seconds < 10) {
                    seconds = "0"+seconds;

                }

                if (minutes < 20) {
                    minutes = "0"+minutes;

                }


            //set the countdown to the starting number
            $(this).text(hours+ ':' +minutes + ':' + seconds).css('fontSize',settings.startFontSize);

            //loopage
            $(this).animate({
            'fontSize': settings.endFontSize
            },settings.duration,'',function() {

        if(settings.direction == 'down'){
            if(to > settings.endNumber + 1) {
            $(this).css('fontSize',settings.startFontSize).text(to - 1).countUpDown(settings,to - 1);
            }
            else{
            settings.callBack(this);
            }
        }

        if(settings.direction == 'up') {
            if(to < settings.endNumber - 1) {
            $(this).css('fontSize',settings.startFontSize).text(to + 1).countUpDown(settings,to + 1);
            }
            else{
            settings.callBack(this);
            }
        }

        });

    });

}; //count up $('#countdown').countUpDown({ direction: 'up', startNumber: 3590, endNumber: 500*500, callBack: function(me) { $(me).text('All done! This is where you give the reward!').css('color','#090'); } }); //count Down /$('#countdown').countUpDown({ direction: 'down', startNumber: 3600, endNumber: 0, callBack: function(me) { $(me).text('All done! This is where you give the reward!').css('color','#090'); } });/

    });

<div id="content">        
      <h1>jQuery CountUP &amp; CountDown Plugin</h1>    
    <p><span id="countdown">All done! This is where you give the reward!</span></p>        
</div>