FisherYates.js

Array.prototype.shuffle = function(array_elements) {
  var i = array_elements.length, randomNum, randomNumIndex;
  while(--i > 0) {
    randomNum = Math.floor(Math.random() * (i + 1));
     randomNumIndex = array_elements[randomNum];
     array_elements[randomNum] = array_elements[i];
     array_elements[i] = randomNumIndex;
  }
  return array_elements;
};