window.addEvent('domready', function() {
    var hider = $('hide_ads');
    if(hider) {
        hider.addEvent('click', function(event) {
            event.stop();
            var req = new Request({url: event.target.getProperty('href'),
                                   method: 'get'});
            req.send();
            $('topad').tween('height', 0);
        });
    }
});