var focused = null;

function ex(id){
	if (focused == id){
		document.getElementById(id).style.display = 'none';
		focused = null;
	}
	else{
		if (focused != null){
			document.getElementById(focused).style.display = 'none';
		}

		document.getElementById(id).style.display = 'block';
		focused = id;
	}
}

function add(form){

	if (document.forms[form].onamae.value == ''){
		alert('名前を入れて下さい。');
		return;
	}

	if (document.forms[form].comment.value == ''){
		alert('コメントを入れて下さい。');
		return;
	}

	document.forms[form].submit();
}