/**
 *
 *icon = "<img src='../common/img/top_new_icon.gif'>";  // 適宜、サイズやalt属性を指定
 */
kikan = 15;      // 日数を変更する場合はこの値

today = new Date();
upday = new Date();
function koushin(y, m, d,icon) {
   icon = "<img src='" + icon + "'>"; 
   upday.setFullYear(y);
   m = m - 1;
   upday.setMonth(m);
   upday.setDate(d);
   difference = today.getTime() - upday.getTime();
   difference = Math.floor(difference / (1000 * 60 * 60 * 24));
   if (difference < kikan) {
      document.write(icon);
   }
}