function countdown(target, element, message) {
    var dn = new Date();
    var dt = new Date(target);
    var diff = dt.getTime() - dn.getTime();
    diff /= 1000;

    // done
    if (diff <= 0) {
        document.getElementById(element).innerHTML = message;
        return (0);
    }

    // days
    var tmp = diff;
    var d = Math.floor(tmp / 24 / 3600);
    tmp = tmp % (24 * 3600);

    // hours
    var h = Math.floor(tmp / 3600);
    tmp = tmp % 3600;

    // minutes
    var m = Math.floor(tmp / 60);
    tmp = tmp % 60;

    // seconds
    var s = Math.floor(tmp);

    var spanStart = "<span class='counteryel'>";

    var spanEnd = "</span>";

    var str = spanStart + d + spanEnd + " ";
    if (d > 4 || d == 0)
        str += "dní, ";
    else if (d > 1)
        str += "dny, ";
    else
        str += "den, ";

    str += spanStart;
    if (h < 10) str += "0";
    str += h + ":";
    if (m < 10) str += "0";
    str += m + ":";
    if (s < 10) str += "0";
    str += s + spanEnd + " hod";

    document.getElementById(element).innerHTML = str;

    setTimeout("countdown('" + target + "','" + element + "','" + message + "')", 999);

    return true;
}