funciona tanto en ie y en mozilla
<html>
<head>
<title></title>
<script type="text/javascript">
function ver()
{
//document.getElementById('celda1').style.display='b lock';
var tester = document.getElementById('Tester');
// if ( tester.style.display == 'none' )
//{
// if (document.all)
tester.style.display = 'block';
//else
// tester.style.display = '';
//}
//else
//{
//tester.style.display = 'none';
//}
}
function ciego()
{
//document.getElementById('celda1').style.display='n one';
var tester = document.getElementById('Tester');
// if ( tester.style.display == 'none' )
//{
// if (document.all)
// tester.style.display = 'block';
//else
// tester.style.display = '';
//}
//else
//{
tester.style.display = 'none';
//}
}
</script>
<style type="text/css">
<!--
.button { font: 11px verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif;
}
-->
</style>
</head>
<body >
<table width="682" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td width="99"><input name="tipotxt" type="radio" value="0" onClick="ciego()">
<strong>Invitado</strong></td>
<td width="202"><input name="tipotxt" type="radio" value="radiobutton" onClick="ver()">
<strong>Registrado</strong></td>
<td width="197"> </td>
<td width="87"> </td>
<td width="28"> </td>
<td width="27"> </td>
<td width="26"> </td>
</tr>
<tr valign="top" >
<td colspan="7"><table width="570" border="0" cellpadding="0" cellspacing="0" id="Tester" style="display: none">
<tr bgcolor="#999999">
<td width="97"> </td>
<td width="250"><strong>
<input type="checkbox" name="menu122" value="32768">
uno </strong></td>
<td width="223"><strong>
<input type="checkbox" name="menu322" value="8">
cuatro</strong> </td>
</tr>
<tr bgcolor="#999999" >
<td> </td>
<td><strong>
<input type="checkbox" name="menu6222" value="16" >
dos </strong></td>
<td><strong>
<input type="checkbox" name="menu422" value="2">
cinco</strong> </td>
</tr>
<tr bgcolor="#999999" >
<td> </td>
<td><strong>
<input type="checkbox" name="menu222" value="4">
tres</strong> </td>
<td><strong>
<input type="checkbox" name="menu522" value="1" onClick="habilitagrupo_grado()">
sesi</strong></td>
</tr>
</table></td>
</tr>
<tr>
<td> </td>
<td colspan="2"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
<p> </p>
<p> </p>
<fieldset class="fieldset">
<legend>
<label for="ctb_field5"></label>
</legend>
</fieldset>
<p> </p>
</body>
</html>