var nowOpen = -1;
var johoMax = 0;

function johoAccordion(n) {

	var i, objJoho;

	if(nowOpen == n) {
		return;
	}

	if(nowOpen == -1){
		objJoho = document.getElementsByTagName('div');
		for(i=0; i<objJoho.length; i++) {
			if(objJoho[i].className == 'johotext') {
				johoMax++;
			}
		}
	}

	for(i=0; i<johoMax; i++) {
		if(i == n) {
			document.getElementById('gaiyou'+i).style.display = 'block';
		}
		else {
			document.getElementById('gaiyou'+i).style.display = 'none';
		}
	}

	nowOpen = n;
}