window.addEvent('domready', function() {
            var navi = $$('.main-navi .level0-active .level1');
            if(navi.getElements('li').length > 0) {
                // li element has 12px height and has a bottom padding of 15px;
                var height = (navi.getElements('li')[0].length * 23);
                var ani = new Fx.Morph(navi[0], {duration: 2000, transition: Fx.Transitions.Linear});
                ani.start({
                    'height': [0, height], //Morphs the 'height' style from 10px to 100px.
                    'opacity': [0.0, 1.0]  //Morphs the 'width' style from 900px to 300px.
                });
            }
        });