Fisher Yates shuffle of a jQuery selection

gistfile1.js

// http://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle
$.fn.scramble = function() {
	var i = this.length;
	if (i > 0) {
		var j;
		var tmp;
		while (--i) {
			j = Math.floor(Math.random() * (i + 1));
			t = this[j];
			this[j] = this[i];
			this[i] = t;
		}
	}
	return this;
};