function new_mark (y,m,d) {
    days = 3; //表示期間の設定
    new_mark_path = "<img src='http://tukizi.jp/web/wp-content/themes/simple/img/new.gif' />"; //Newマークのあるパス
    newday = new Date(y+"/"+m+"/"+d);
    oldday = new Date();
    set_term = (oldday-newday)/(1000*60*60*24);
    if (set_term <= days) document.write(new_mark_path);
}