function sleep(milliseconds) {
    var start = new Date().getTime();
    while (true) {
        if ((new Date().getTime() - start) > milliseconds) {
            break;
        }
    }
}

$(document).ready(function() {
    $('#page').css('marginTop', $(document).height() / 2 - $('#page').height() / 2);
    $('#page').css('visibility', 'visible');
    sleep(200);
});