Extending movieclip class and assigning dynamically to a class

programming flash
1

i am trying to extend a moviclip in action script 2 but i am not able to assign to a movieclip dynamically… how do i do it?

here is the code i have written… it doesnt seem to work… somebody help me please

class game.handler extends MovieClip
{

public function onLoad()
{
    trace(this);
    trace("loaded");
}

public function onEnterFrame()
{
    trace("hai");
}

}
import game.handler;
var box:handler=new handler(this.attachMovie(“handler”,“handler”,this.getNextHighestDepth()));