Bonjour,
Une solution parmis tant d'autre :
<html>
<body>
<head>
<script language="javascript">
function afficher(theid,theid2)
{
document.getElementById(theid).style.display = 'block';
document.getElementById(theid2).style.display = 'none';
}
</script>
</head>
<form name="maform" >
<input type=radio name="monradio" onclick="afficher('madiv2','madiv1')">OUI
<br> <div id="madiv2" style="display: none">
<table border="1">
<tr>
<td>
Commentaire: <input type=text name="moninput1">
</td>
</tr>
</table>
</div>
<input type=radio name="monradio" onclick="afficher('madiv1','madiv2')">NON
<br> <div id="madiv1" style="display: none">
<table border="1">
<tr>
<td>
Commentaire: <input type=text name="moninput1">
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
Bonne journée :)