Need help with attachMovie

Sorry, I don’t know what to call the functions I want to perform!

But, I have 20 mcs for navigation at the bottom of my page. When each one is clicked, a new movie clip loads into the center of the page, leaving the mcs at the bottom visible.

I don’t know what kind of code to use to do this.

(one_mc is at the bottom and aaa_mc is what i want to load)
Right now I have:


one_mc.onRelease = function() {
    this._parent.attachMovie("aaa_mc", "aaa_mc", 1);

};

Do I need to load aaa_mc into an empty movieclip and keep loading the others on top of it? I’m confused about how to make the active one visible but the others not.

Can anyone give me an example of how this code should look?
thanks!