var gallery = {

    display: function (el) {
        var g = app.get('gallery');
        var v = app.get('gallery-large');
        var l = g.getElementsByTagName('IMG');
        for (var i = 1; i < l.length; i++) {
            if (el == l[i]) {
                l[i].className = 'active';
            } else {
                l[i].className = '';
            }
        }
        v.src = el.src.replace('.small.', '.large.');
    }
}