(function($) {
  $.fn.jclock = function(options) {
    $.fn.jclock.timerID = null;
    $.fn.jclock.running = false;
    $.fn.jclock.el = null;
    var version = '0.1.0';

    // options
    var opts = $.extend({}, $.fn.jclock.defaults, options);
         
    return this.each(function() {
      $this = $(this);
      $.fn.jclock.el = $this;

      var o = $.meta ? $.extend({}, opts, $this.data()) : opts;

      $.fn.jclock.timeNotation = o.timeNotation;
      $.fn.jclock.am_pm = o.am_pm;
      $.fn.jclock.utc = o.utc;

      $this.css({
        fontFamily: o.fontFamily,
        fontSize: o.fontSize,
        backgroundColor: o.background,
        color: o.foreground
      });

      $.fn.jclock.startClock();

    });
  };
       
  $.fn.jclock.startClock = function() {
    $.fn.jclock.stopClock();
    $.fn.jclock.displayTime();
  }
  $.fn.jclock.stopClock = function() {
    if($.fn.jclock.running) {
      clearTimeout(timerID);
    }
    $.fn.jclock.running = false;
  }
  $.fn.jclock.displayTime = function(el) {
    var time = $.fn.jclock.getTime();
    $.fn.jclock.el.html(time);
    timerID = setTimeout("$.fn.jclock.displayTime()",1000);
  }
  $.fn.jclock.getTime = function() {
    var now = new Date();
    var hours, minutes, seconds;

    if($.fn.jclock.utc == true) {
      hours = now.getUTCHours();
      minutes = now.getUTCMinutes();
      seconds = now.getUTCSeconds();
    } else {
      hours = now.getHours();
      minutes = now.getMinutes();
      seconds = now.getSeconds();
    }

    if ($.fn.jclock.timeNotation == '12h') {
      hours = ((hours > 12) ? hours - 12 : hours);
    } else {
      hours   = ((hours <  10) ? "0" : "") + hours;
    }

    minutes = ((minutes <  10) ? "0" : "") + minutes;
    seconds = ((seconds <  10) ? "0" : "") + seconds;

    var timeNow = hours + ":" + minutes + ":" + seconds;
    if ( ($.fn.jclock.timeNotation == '12h') && ($.fn.jclock.am_pm == true) ) {
      timeNow += (hours >= 12) ? " P.M." : " A.M."
    }

    return timeNow;
  };
       
  // plugin defaults
  $.fn.jclock.defaults = {
    timeNotation: '12h',
    am_pm: false,
    utc: false,
    fontFamily: '',
    fontSize: '',
    foreground: '',
    background: ''
  };
})(jQuery);