window.addEvent('domready', function() {
    new SmoothScroll({
        duration: 500
    });

    $('gototop').set('opacity', '0').setStyle('display', 'block');
    window.addEvent('scroll',
    function(e) {
        $('gototop').fade((window.getScroll().y > 300) ? 'in': 'out')
    });
});