Load external SWF in Main from external SWF

Ok,

Here’s my problem…

Can someone explain to me how to load an external swf from an external Swf into the main, and what level it should go on? My example:

I have a main where MENU loads as an external SWF on the initial load… On MENU there is a button to load GALLERY back into the main… I want it to replace level 1. I have placed an empty container for the GALLERY with the instance name “mygallery” on my main. What is the code to put on the button… so far I have:

on (release)
{
_root.mygallery.loadMovie(“gallery.swf”, 3);
}

I am calling this to load on level 3… should I be doing that? Also, could someone please tell me what code I should have on my main for the container. I have:

createEmptyMovieClip(“gallery_holder”, 3);

I hope I explained this well enough, I’m kinda new at this and trying to learn my best… THANKS!