Event.onDOMReady(function() {
    var promoSets = $('promos');
    var promos = promoSets.select('a');
    promos.each(function(promo, i) {
        promo.writeAttribute('position', i+1);
    });

    $('promos').observe('mousedown', function(evt) {
        var position = evt.findElement('a').readAttribute('position'),
        image;
        if(typeof evt.findElement('img')==='undefined'){
            image = 'http://images.apple.com/lae/home/scripts/promo-billion-downloads.jpg';
        } else {
            image = evt.findElement('img').src;
        }
        image = image.substring(image.lastIndexOf('/')+1, image.length);
        AC.Tracking.trackClick({
            prop2: position,
            prop3: 'p@' + image + ' - ' + AC.Tracking.pageName()
            }, this, 'o', 'p@' + image + ' - ' + AC.Tracking.pageName());
    });
});