javascript: array shuffle

gistfile1

// reference: http://www.hardcode.nl/subcategory_1/article_317-array-shuffle-function
Array.prototype.shuffle = function() {
 	var len = this.length;
	var i = len;
	 while (i--) {
	 	var p = parseInt(Math.random()*len);
		var t = this[i];
  	this[i] = this[p];
  	this[p] = t;
 	}
};