window.addEvent('domready', function() {
    function start_fading(items) {
        // set initial styles
        items.setStyles({
            'top' : 0,
            'left' : 0,
            'position' : 'absolute',
            'z-index' : 0,
            'opacity' : 0
        });

        var item_iter = 0;
        var do_tween = function() {
            var current_item = items[item_iter % items.length];
            var next_item = items[(item_iter+1) % items.length];

            current_item.setStyle('z-index', 0);
            next_item.setStyle('z-index', 1);

            current_item.tween('opacity', 0);
            next_item.tween('opacity', 1);

            item_iter++;
            window.setTimeout(do_tween, 5000);
        };

        do_tween();
    }

    // init sponsors
    var financiers = $$(".financiers.partner a");
    start_fading(financiers);

    // init clubs
    var clubs = $$(".clubs.partner a");
    start_fading(clubs);
});