Help with loading external movie clip(beating a dead horse)

Hello folks, I seem to have run into some problem with a project of mine. I have a Main movie which loads multiple external movies. I am using an empty movie clip called contents to load them into.

one of my external movies has a button in it that launches a centered pop up window(kirupa tutorial). This external movie named site works perfectly by itself, but when loaded into the main movie, the button does not work. I’m using:

on (release) {
_root.contents.loadMovie(“site.swf”);
}

any input would be greatly appreciated.