public BBFlashMovie getChildByClassName(string name){
if(name==null)
return null;
for(int i=0; i<_depth_displays.Length; i++){
DisplayObject child = _depth_displays[i];
if(child!=null && child.className == name){
return child as BBFlashMovie;
}
}
return null;
}
public BBFlashMovie getChildByInstanceName(string name){