window.addEvent('domready', function() {
    $$('.slider').each(function(el){
        var fx = new Fx.Slide(el.getElement('div')).hide();
        el.getElement('a.s_in').addEvent('click',function(e){
            e.stop();
            fx.slideIn();
        });
        el.getElement('a.s_out').addEvent('click',function(e){
            e.stop();
            fx.slideOut();
        });
    });
});