// Display Score
var displayScoreLevel = function(aScore, aLevel) {
  var canvas = document.getElementsByTagName('canvas');
  var firstCanvasTag = canvas[0];
  scoreLevelDiv.innerHTML = 'Score : ' + aScore + ' / ' + 'Level : ' + aLevel;
  document.body.insertBefore(scoreLevelDiv, firstCanvasTag[0]);
};