function monthChange(dispFlg){
	if(dispFlg=="1"){
		//翌月表示
		document.getElementById('calendar_2').style.display= "block";
		document.getElementById('calendar_1').style.display= "none";
	}else{
		//当月表示
		document.getElementById('calendar_1').style.display= "block";
		document.getElementById('calendar_2').style.display= "none";
	}
}