function kousin() {
     var lastday = new Date( document.lastModified );
     var year= lastday.getYear();
     if (navigator.appName.charAt(0)=="N") {
        year=year+1900;
     } 
     var month= 1 + lastday.getMonth();
     var day = lastday.getDate();
     var str = "最終更新: " + year + "年" + month + "月" + day + "日";
     document.getElementById("kousin").innerHTML = str;
//     document.getElementById("kousin").childNodes[0].nodeValue = str;
}
/*function kousin() {
     var str;
     var lastday=document.lastModified;
        var year = lastday.substring(6,10);
        var month = lastday.substring(0,2);
        var day = lastday.substring(3,5);
        str = "最終更新: " + year + "年" + month + "月" + day + "日";
     }
     document.getElementById("kousin").innerHTML = str;
}*/