<script>
function visual(L) {
document.getElementById('div_'+L).style.display = 'block';
}
function hidden(L) {
document.getElementById('div_'+L).style.display = 'none';
}
</script>


</head>

<body>
<input type="checkbox" name="prima" value="A" onClick="if(this.checked){visual("A");}else{hidden ("A");}"/>prova2


<div id="div_A" style="display:none;">
<table>
<tr>
<td bgcolor="orange">
<input type="text" name="animale" value="cane">prova1


<input type="text" name="animale" value="gatto">prova1
</td>
<td>
testo prova
</td>
</tr>
</table>
</div>

non funzeca...questo è lo script