Swf going on top of each other with loadMovie

1

I load several swf with for example
this.createEmptyMovieClip(“container”, this.getNextHighestDepth);
container._x = 0;
container._y = 0;
a_mc.onRelease = function() {
container.loadMovie(“aerialgallery.swf”);
//_level0._visible = 0;I TRIEd TO PUT LEVEL 0 =0 but nothing appears anymore.
};
hetl_mc.onRelease = function() {
container.loadMovie(“hotelgallery.swf”);
//_level0._visible = 0;
};
Swf are appearing but on the top of each other.
Is the loadMovie not supposed to unload a swf when load another one ?
Thanks