// 背景画像
  var topImg = new Array(0); // 月毎の画像データを格納する2次元配列変数を定義
  topImg[0] = new Array("22", "23", "24"); //1月
  topImg[1] = new Array("44", "45", "46"); //2月
  topImg[2] = new Array("18", "19", "20"); //3月
  topImg[3] = new Array("21", "32", "33"); //4月
  topImg[4] = new Array("4", "25", "29"); //5月
  topImg[5] = new Array("36", "40", "41"); //6月
  topImg[6] = new Array("3", "5", "6"); //7月
  topImg[7] = new Array("5", "38", "42"); //8月
  topImg[8] = new Array("43", "34", "39"); //9月
  topImg[9] = new Array("35", "26", "27"); //10月
  topImg[10] = new Array("7", "10", "28"); //11月
  topImg[11] = new Array("14", "15", "16"); //12月
  dt = new Date();
  ss=dt.getSeconds();
  hh=dt.getHours();
  dd=dt.getDate();
  mm=dt.getMonth();
  if (ss <= 20)      { nimg=topImg[mm][0]; }
  else if (ss <= 40) { nimg=topImg[mm][1]; }
  else               { nimg=topImg[mm][2]; }
  if (hh < 5 || hh > 19) { bgimg="3"; }
  else if (hh < 12)      { bgimg="1"; }
  else                   { bgimg="2"; }