loadMovieNum Next Level up?

Is it possible to create some sort of variable which could be passed as the level between a series of loadMovieNUm events, something like:

var movieLevel:Number=5;

Then which each new loadMovieNum statement, have something like:

movieLevel++
loadMovieNum(“myMovie”,movieLevel)

I’m trying to set up a series of loads which the user can perform backwards and forwards. Currently, with designated levels, some movies are, upon the user clicking “Previous,” loading underneath the movie already in place.