Array.prototype.mixElements = function() {
 var _length:Number = this.length, rn:Number, it:Number, el:Object;
 for (it = 0; it<_length; it++) {
 el = this[it];
 this[it] = this[rn = random(_length)];
 this[rn] = el;
 }
}

function mixArray(array:Array):Array {
 var _length:Number = array.length, mixed:Array = array.slice(), rn:Number, it:Number, el:Object;
 for (it = 0; it<_length; it++) {
 el = mixed[it];
 mixed[it] = mixed[rn = random(_length)];
 mixed[rn] = el;
 }
 return mixed;
 }