function autoRenew() {
    var modified = new Date(document.lastModified);
    var year = modified.getFullYear();
    var month = modified.getMonth()+1;
    var date = modified.getDate();
    var week = modified.getDay();

    var weekchars = new Array("日", "月", "火", "水", "木", "金", "土");
    var todayweek = weekchars[week];
    time = "更新日："+year+"年"+month+"月"+date+"日（"+todayweek+"）";
    document.getElementById("uptime").innerHTML = time;
}

function logLoad() {
    var url = "logdata.txt";
    var options = {
        method: "get",
        onComplete: function(request) {
            readtext = request.responseText;
            $('log').innerHTML = readtext.replace('\n','<br>');
        },
        onFailure: function(request) {
             alert('読み込みに失敗しました');
        }
    }
    new Ajax.Request(url, options);
}