Unloading movie in level 1- how can user get back to _root?

On the main timeline I have got a page with a button that the user clicks on to ‘view swf’- then the movie loads into level 1, but how can the user activate the unload movie’?- how can I script a mouse event to unload the movie without a button on top of the swf file in level 1?
Better still, I would rather play the movie in level 0, replacing the main movie as you can see through it and so I need to overcome this as well, as both movies are not related.

If you load any movie into the same level it will delete the current movie of that level. It’s still in the cache of the comp, so it wont have to be downloaded again, but it will be out of the player as far as action goes.