LoadMovie Problems

I have a site which I created using Flash MX 2004 and it used LoadMovie (back then there was no Security Clearances you needed to do so),
I’ve updated the site to Flash 8, and since then the LoadMovie command won’t work.
I’m loading the external SWF’s locally (I call them by name, not by domain name + name),
for some peculiar reason, the site still perfectly works in IE but doesn’t seem to work in Firefox, each time I click on a menu item, it simply doesn’t load it.

What commands do I need to use to get this “security clearance” off my back,
and why does it work in IE but not in Firefox…