<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>test</title>
<script type="text/javascript" src="js/jquery-1.3.2.js"></script>
<script type="text/javascript">
$(function(){
$('#tt').click(function() {
var rd = $("input[type=radio][name=area]:checked").val();
if ( typeof(rd) == 'undefined') {
alert('aaa');
}
alert(typeof(rd));
});
});
</script>
</head>
<body>
<input type="radio" name="area" value="1" />111<input type="radio" name="area" value="2" />222
<input type="button" value="Test" id="tt" />
</body>
</html>
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