var newObj:Object = Object(ObjectUtil.copy(oldObj));

function clone(source:Object):* {
 var copier:ByteArray = new ByteArray();
 copier.writeObject(source);
 copier.position = 0;
 return(copier.readObject());

newObjectCopy = clone(originalObject);

// duplicate any given Object (not MCs)
 Object.prototype.copy = function()
 {
     ASSetPropFlags(Object.prototype,["copy"],1);

     var _t = new this.__proto__.constructor(this) //

     for(var i in this){
         _t[i] = this[i].copy()
     }
     return _t
 };

x = ["1","2","3",[4,5],[{a:1,b:2}]]

y = x.copy()

y[0] = 0

y[3][0]="d"

trace(x)

trace(y)