Help loading MovieClip buttons

1

Hi, I’m trying to use a movieClip as a button and want to create a function that removes the movieClip onRelease and loads a new button. and vice versa, every method I’ve tried either removes the movieClip completely or loads it on top of the old movie . I’m using the attach movieClip method…
if any one can show me where I’m going wrong I’d really appreciate it…
Here is my code:

mb11.onRelease = function() {
_root.attachMovie( “bb1”, “bb11”, this.getNextHighestDepth );
mb11.removeMovieClip();
TweenLite.from(container_mc, 1, {_y:0, ease:None});
TweenLite.to(container_mc, 1, {_y:-480, ease:Bounce.easeOut});
}

mb11.onRelease  = function() {
_root.attachMovie( "bb1", "bb11", this.getNextHighestDepth );
mb11.removeMovieClip();
    TweenLite.from(container_mc, 1, {_y:0, ease:None});
        TweenLite.to(container_mc, 1, {_y:-480, ease:Bounce.easeOut});
}