function cldr(){
cldr = ""; 
day = new Date(); 
thisday = day.getDate();  //今日の日付 - 背景色を変更するため 
day.setDate(1);       //今月最初の日にセット 
month = day.getMonth() + 1; 
 
year = day.getYear(); 
if(year < 2000) year += 1900; 
numdays = new Array(31,28,31,30,31,30,31,31,30,31,30,31); 
 
// うるう年 
if((year%4 == 0) && (year%100 != 0) || (year%400 == 0)) numdays[1] = 29; 
 
// 休日の定義 
if(month == 1){holiday1 = 1; holiday2 = 14-(day.getDay()+5)%7; holiday3 = -1}  //成人の日 
else if(month == 2){holiday1 = 11; holiday2 = -1; holiday3 = -1} 
else if(month == 3){ 
  ed =  20.8431 + 0.242194 * (year - 1980) - Math.floor((year - 1980)/4);  //春分の日 
  holiday1 = Math.floor(ed); 
  holiday2 = -1; 
  holiday3 = -1; 
} 
else if(month == 4){holiday1 = 29; holiday2 = -1; holiday3 = -1} 
else if(month == 5){holiday1 = 3; holiday2 = 5; holiday3 = 6} 
else if(month == 6){holiday1 = -1; holiday2 = -1; holiday3 = -1} 
else if(month == 7){holiday1 = 21-(day.getDay()+5)%7; holiday2 = -1;holiday3 = -1} 
else if(month == 8){holiday1 = -1; holiday2 = -1; holiday3 = -1} 
else if(month == 9){ 
  holiday1 = 21-(day.getDay()+5)%7; 
  ed =  23.2488 + 0.242194 * (year - 1980) - Math.floor((year - 1980)/4);  //秋分の日 
  holiday2 = Math.floor(ed); 
  holiday3 = -1 
} 
else if(month == 10){holiday1 = 14-(day.getDay()+5)%7;; holiday2 = -1; holiday3 = -1}  //体育の日 
else if(month == 11){holiday1 = 3; holiday2 = 23; holiday3 = -1} 
else if(month == 12){holiday1 = 23; holiday2 = -1; holiday3 = -1} 
// 休日の定義終わり 
 
 
// カレンダー本体 
cldr += "<table border>"; 
cldr += "<tr align=center><th colspan=7>"+month+"月</th></tr>"; 
cldr += "<tr align=center><th><font color=\"#ff0000\">日</a></th><th>月</th><th>火</th><th>水</th><th>木</th><th>金</th><th><font color=\"#0000ff\">土</a></th></tr>"; 
 
 
// 日付の書き込み 
for(sunday = 1-day.getDay(); sunday <= 31; sunday +=7){ 
  cldr += "<TR align=center>"; 
  for(i = sunday; i < sunday + 7; i++){ 
    if((i > 0) && (i <= numdays[month-1])){ 
      day.setDate(i); 
      today = day.getDay(); 
 
      if(thisday == i) cldr += "<td bgcolor='#00ff00'>";    // 今日の背景色を緑にする 
        else cldr += "<td>"; 
 
      if(today == 0){ 
        cldr += "<font color=\"#ff0000\">"+ i +"</font></td>"; 
      }else if((i == holiday1)||(i == holiday2)||(i == holiday3)){ 
        cldr += "<font color=\"#ff0000\">"+ i +"</font></td>"; 
      }else if((today == 1)&&((i-1 == holiday1)||(i-1 == holiday2)||(i-1 == holiday3))){ 
        cldr += "<font color=\"#ff0000\">"+ i +"</font></td>"; 
      }else if(today == 6){ 
        cldr += "<font color=\"#0000ff\">"+ i +"</font></TD>"; 
      }else{ 
        cldr += ""+ i +"</td>"; 
      } 
 
    }else{ 
      cldr += "<td></td>"; 
    } 
  } 
  cldr += "</TR>"; 
} 
 
 
cldr += "</TABLE>"; 
 
document.write(cldr); 
}