Garrys808,
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<input name="free_place" type="radio" value="1">Да<input name="free_place" type="radio" value="2" checked="checked">Нет
<input name="selectauto" type="radio" value="1"><input name="selectauto" type="radio" value="2">
<script type="text/javascript">
function chk(name){
var opt=document.getElementsByName(name);
for (var i=0; i<opt.length; i++)
if (opt[i].checked) return true;
return false;
}
function checkForm(){
if (chk('free_place') && chk('selectauto')) return true;
alert('Вы указали не всю информацию!!!');
return false
}
checkForm()
</script>
</body>
</html>