In place Fisher-Yates shuffle in Javascript.

FisherYatesShuffle.js

function FisherYatesShuffle (arr) {
	var randInt = function (min, max) {
		return Math.floor(Math.random() * (max - min + 1) + min);
	};

	var swap = function (pos1, pos2) {
		var temp = arr [pos1];
		arr [pos1] = arr [pos2];
		arr [pos2] = temp;
	};


	for (var i = arr.length - 1; i != 0; i--) {
		swap (randInt (0, i), i);
	}
	return arr;
}