Alright I have a my main scene and a navigation bar and each button loads a new movie w. load movie action

loadMovieNum ("opp.swf", 1);

For an example of one button action. Well when it loads it loads above the background nav bar. Can I make the movie load under that main scence, or could I make a BLANK MOVIE SYMBOL and load the movie to that and the MOVIE SYMBOL will be on a frame that is below the main one ... ????

Thanks for the help