Event.observe(window, 'load', function() {
    new Ajax.PeriodicalUpdater('pinger', '/ping.pong', {
        method: 'get', frequency: 10, decay: 1.25
    });
});

Event.observe(window, 'load', function() {
    var img = "disclaimer.png";
    if (screen.width < 1025) {
        img = "disclaimer-lowres.png";
    } else {
        img = "disclaimer-hires.png";
    }
    $("disclaimer_img").setAttribute('src', "/images/" + img);
});