ok, tanto é solo una prova con due elementi in croce...

grazie

codice:
<%@LANGUAGE="VBSCRIPT"%>
<html>
<head>
<title>Documento senza titolo</title>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<style type="text/css">
<!--
.prova {
	color: #CCCCCC;
	visibility: hidden;
}
-->
</style>
</head>

<body>
<form name="form1" method="post" action="">
  


    <input type="radio" name="radiobutton" value="radiobutton"  onClick="document.form1.Tabella.className='prova'">
  </p>
  <table width="500" border="0" cellpadding="3" cellspacing="0" id="Tabella" >
    <tr> 
      <td>proviamo</td>
      <td></td>
    </tr>
    <tr> 
      <td></td>
      <td><input name="textfield" type="text"></td>
    </tr>
    <tr> 
      <td></td>
      <td>vediamo un p&ograve;</td>
    </tr>
  </table>  


    <input type="submit" name="Submit" value="Invia">
  </p>
</form>


</p>
</body>
</html>