How to reload a custom class

programming flash
1

i have this script shortened:

public class Main extends MovieClip {
var news_mc:NEWS = new NEWS();
var studio_mc:STUDIO = new STUDIO();
var webworks_mc:WEBWORKS = new WEBWORKS();
var print_mc:PRINT = new PRINT();
var contact_mc:CONTACT = new CONTACT();
public function Main() {
}
}

I quickly realize that all the custom classes is already loaded in the first frame, but i have to declare them at the start of the package because i want to use the variable anywhere in the class file.

the problem is, i have some scripted animation on the custom classes, and once i addChild anyone of the custom class, it immediately go to the part where the scripted animation is finished(it was already loaded in the first frame, i think the animation is already played on the background).

so i created a new private function so that the animation would be reseted:

    private function Reset(num:uint) {
        switch (num) {
            case 1 :
                news_mc = new NEWS();
                break;
            case 2 :
                studio_mc = new STUDIO();
                break;
            case 3 :
                webworks_mc = new WEBWORKS();
                break;
            case 4 :
                print_mc = new PRINT();
                break;
            case 5 :
                blog_mc = new BLOG();
                break;
            case 6 :
                contact_mc = new CONTACT();
                break;
        }
    }

it’s working good and all, but it seem to get laggish after a while, i got a feeling that it’s taking up too much resources. I’m new to AS3, i’m not even sure if tis is the best way to do it, help~~