var epigen = function() {
    return {
        init : function() {
            $('#main_nav .top ul').hide(); 
            $('#main_nav').accordion({ 
                    header: '.top', 
                    navigation:true,
                    fillspace:true,
                    active: true, 
                    alwaysOpen: false, 
                    animated: 'slide', 
                    autoheight: false 
                });
        }
    }
}();
$(epigen.init);