gistfile1.txt

var interval = document.createElement('div');
interval.id = 'interval'
interval.style = 'margin-left: 600px;'
document.getElementsByClassName('code')[0].appendChild(interval);
var start = Date.now();
setTimeout(function () {
  var interval_time = Math.floor((Date.now() - start)/1000);
  var minutes = Math.ceil(interval_time/60 - 1);
  var seconds = interval_time%60;
  interval.innerHTML = "Oh, you have been cheating: " + minutes + 'minutes ' + seconds + ' seconds!!'
  setTimeout(arguments.callee, 1000);
});