vk.js

var f = function () {
    var d = new Date();
    var nd = new Date(d.getTime() + (d.getTimezoneOffset() * 60000) + (3600000 * 4));
    var e = new Date(new Date(2014, 1, 1, 0, 0, 0, 0).getTime() - nd.getTime());
    var req = new XMLHttpRequest();
    req.open("POST", "/al_page.php", true);
    req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    req.send("act=current_info&al=1&hash=your_info_hash&info=" + e.getHours() + "h " + e.getMinutes() + "m&oid=your_oid");
}

var int = window.setInterval(f, 60000)