window.addEvent('domready', function(){
    $$('div.chooser a').addEvent('click', function(e) {
        new Event(e).stop();
        $$('div.chooser a').removeClass('on');
        this.addClass('on');
        $$('div.big-image img').setProperty('src', this.getAttribute('href'));
        $$('div.portfolio-gallery h3').setText(this.getAttribute('title'));
    });
});