shuffle array

// http://stackoverflow.com/questions/2450954/how-to-randomize-a-javascript-array
// SHUFFLE ARRAY
function shuffle(array) {
	var currentIndex = array.length,
		temporaryValue, randomIndex;

	// While there remain elements to shuffle...
	while (0 !== currentIndex) {

		// Pick a remaining element...
		randomIndex = Math.floor(Math.random() * currentIndex);
		currentIndex -= 1;

		// And swap it with the current element.
		temporaryValue = array[currentIndex];
		array[currentIndex] = array[randomIndex];
		array[randomIndex] = temporaryValue;
	}

	return array;
}