Draging in As 3.0

myobj.addEventListener(MouseEvent.MOUSE_DOWN,startdrag);
myobj.addEventListener(MouseEvent.MOUSE_UP,stopdrag);
var clickoffset:Point=null;
function startdrag(event:MouseEvent)
{
clickoffset=new Point(event.localX,event.localY);
}
function stopdrag(event:MouseEvent)
{
clickoffset=null;
}
stage.addEventListener(Event.ENTER_FRAME,drag);
function drag(event:Event)
{
if(clickoffset!=null)
{
myobj.x=mouseX-clickoffset.x;
myobj.y=mouseY-clickoffset.y;
}
}