AS2 - need help with menu movieclips

Yes, the code to link to an html is on the button "link = "index.html" which is called by the hit button inside that movie clip "getURL

(link)". But I don't want it to call a link. I want it to call an external swf to the main timeline inside an empty movie clip I have created. But when I tried to put in _root.empty_mc.loadMovie("home.swf"); on the main button movie clip in place of the "link = index.html", it doesn't work. I get an "undefined" error.

Actually, the link does do something and I've been able to make some progress but now it's another issue.

Here's the code on the menu movieclip (there are 9 menu buttons and each one is coded so that it's supposed to pull up the corresponding SWF):

HOME BUTTON:

onClipEvent (load) {
num = 1;
link = "home.swf";
}

WEB DESIGN BUTTON:

onClipEvent (load) {
num = 2;
link = "webdesign.swf";
}

--------------------------------------------------------

Here's the action inside the button:

on (rollOver) {
if (_root.link<>num) {
  gotoAndPlay("s1");
  _root.l["l"+num].gotoAndPlay("s1");
  _root.l["l"+(num-1)].gotoAndPlay("s1");
}
}
on (releaseOutside, rollOut) {
if (_root.link<>num) {
  gotoAndPlay("s2");
  _root.l["l"+num].gotoAndPlay("s2");
  _root.l["l"+(num-1)].gotoAndPlay("s2");
  _root.for_line = num;
}
}
on (release) {
if (_root.link<>num) {
  _parent["item"+_root.link].gotoAndPlay("s2");
  _root.all_sub_button["item"+_root.link].gotoAndPlay("s2");
  _root.l["l"+_root.link].gotoAndPlay("s2");
  _root.l["l"+(_root.link-1)].gotoAndPlay("s2");
  _root.link = num;
  _root.all_sub_button["item"+_root.link].gotoAndPlay("s1");
  _root.empty_mc.loadMovie(link); THIS IS WHAT I CHANGED FROM THE ORIGINAL POST
}
}

On the main timeline is an empty movieclip. The problem is that the only swf that is working is the home.swf. Even though the webdesign.swf was a copy of the home document, it doesn't load correctly. See example here:  http://www.n2dzyne.com/testing/vsm_flash_v4.html. NOTE, the only buttons with code on them right now that are supposed to work are HOME, WEB DESIGN, WEB HOSTING, AND LOGO DESIGN. All of these are pointing to the home.swf except the web design and the logo design.

I am baffled as to why it would load the home.swf but not the others when the others were created from the same file and the only thing I changed was the file name.