ActionScript 3.0 :: Giving Each Duplicate A Variable?

PHP Code:

stage.addEventListener (Event.ENTER_FRAME, lala);
function lala (event:Event) {
var object = new object_mc;

[code]...

How do I correctly declare a variable for each duplicate? The final line doesn't work in AS3 but it does in AS2. I want the same variable for each duplicate that I can individually change. Also how do I make a function for each duplicate? In AS2 I can do it by:

PHP Code:

object = duplicateMovieClip(........);
object.onEnterFrame = function () {
.........
}