window.onload = googleCalendarSet;
function googleCalendarSet(){
//カレンダーの埋め込みコードをコピペして分割する
var calendarCode1 = '<iframe src="https://calendar.google.com/calendar/embed?';
var calenderCode2 = 'height=600&amp;wkst=1&amp;bgcolor=%23ffffff&amp;ctz=Asia%2FTokyo&amp;src=YnJvdGhlci50b2t5by5zaG93cm9vbUBnbWFpbC5jb20&amp;src=amEuamFwYW5lc2UjaG9saWRheUBncm91cC52LmNhbGVuZGFyLmdvb2dsZS5jb20&amp;color=%2322AA99&amp;color=%231F753C&amp;showTitle=0&amp;showNav=0&amp;showPrint=0&amp;showTabs=0&amp;showCalendars=0&amp;showTz=0" style="border-width:0" width="800" height="600" frameborder="0" scrolling="no"></iframe>'
/*来月のカレンダー*/
var today = new Date;
var myYear = today.getFullYear();//年を取得
var myMonth = today.getMonth()+1;//月を取得、1月が0から始まるからややこしい
var nextMonth = myMonth+1;



//12月を超えると1月に
if(nextMonth>12){nextMonth-=12;myYear+=1;};
//10以下を二ケタに
if(nextMonth<10){nextMonth = "0"+nextMonth;};
//日付を出力
var dates = "dates="+String(myYear)+String(nextMonth)+"01/"+String(myYear)+String(nextMonth)+"01&amp;";
//指定したidを書き換え
document.getElementById("nextMonthCal").innerHTML = calendarCode1+dates+calenderCode2;
/*再来月のカレンダー*/
var next2Month = myMonth+2;
if(next2Month>12){next2Month-=12;
if(nextMonth==12){myYear+=1;};

};
if(next2Month<10){next2Month = "0"+next2Month;};
var dates = "dates="+String(myYear)+String(next2Month)+"01/"+String(myYear)+String(next2Month)+"01&amp;";

/*今月のカレンダー*/
document.getElementById("MonthCal").innerHTML = calendarCode1+calenderCode2;
}