function display_date(date,flg){
if(date==undefined){
//	date = '1'; //4-7月
	date = '2'; //8-11月
//	date = '3'; //12-3月
}

	switch(date) {
		case "1":
			document.getElementById("contents01").style.display = "block";
			document.getElementById("contents02").style.display = "none";
			document.getElementById("contents03").style.display = "none";
			document.getElementById("img04").src="../images/year/tab_47_on.gif";
			document.getElementById("img08").src="../images/year/tab_811_off.gif";
			document.getElementById("img12").src="../images/year/tab_123_off.gif";			
			break;
		case "2":
			document.getElementById("contents01").style.display = "none";
			document.getElementById("contents02").style.display = "block";
			document.getElementById("contents03").style.display = "none";
			document.getElementById("img04").src="../images/year/tab_47_off.gif";
			document.getElementById("img08").src="../images/year/tab_811_on.gif";
			document.getElementById("img12").src="../images/year/tab_123_off.gif";
			break;
		case "3":
			document.getElementById("contents01").style.display = "none";
			document.getElementById("contents02").style.display = "none";
			document.getElementById("contents03").style.display = "block";
			document.getElementById("img04").src="../images/year/tab_47_off.gif";
			document.getElementById("img08").src="../images/year/tab_811_off.gif";
			document.getElementById("img12").src="../images/year/tab_123_on.gif";
			break;
		default:
			break;
	}
	if(flg!=undefined){
		location.hash=flg;
	}
	return;
}