function showLayer(idName) { 
	if (document.getElementById) {
		if (document.getElementById(idName).style.display == "none") {
			document.getElementById(idName).style.display = "block" ;
		}
	}
	else if (document.all) {
		if (document.all(idName).style.display == "none") {
			document.all(idName).style.display = "block" ;
		}
	}
}

function hideLayer(idName) {
	if (document.getElementById) {
		document.getElementById(idName).style.display = 'none' ;
	}
	else if (document.all) {
		document.all(idName).style.display = 'none' ;
	}
}

function changeLayer(currentNum) {
	for (var i = 1; i <= 3; i++) {  //2ヶ月表示の時はi<=2、3ヶ月表示の時はi<=3
		if (i == currentNum) {
			showLayer('schedule0' + i);
		}
		else {
			hideLayer('schedule0' + i);
		}
	}

}