Questo dimostra il mio impegno ma non riesco ad andare avanti:

<script>
function checkAllrigo1(field) {
if (document.consform.rigo1cbh.checked==true) {
for (i = 0; i < field.length; i++) {
field[i].checked = true ;
}
} else {
for (i = 0; i < field.length; i++){
field[i].checked = false ;
}
}
}
function checkAllrigo2(field) {
if (document.consform.rigo2cbh.checked==true) {
for (i = 0; i < field.length; i++) {
field[i].checked = true ;
}
} else {
for (i = 0; i < field.length; i++){
field[i].checked = false ;
}
}
}
function checkAllrigo3(field) {
if (document.consform.rigo3cbh.checked==true) {
for (i = 0; i < field.length; i++) {
field[i].checked = true ;
}
} else {
for (i = 0; i < field.length; i++){
field[i].checked = false ;
}
}
}
</script>
<form name="consform" method="post" action="#">
<table width="200" border="1">
<tr bgcolor="#999999">
<td align="center"></td>
<td align="center"></td>
<td align="center"></td>
<td align="center"></td>
</tr>
<tr>
<td align="center" bgcolor="#999999"><input type="checkbox" name="rigo1cbh" value="cbh" onclick="checkAllrigo1(document.consform.rigo1);" /></td>
<td align="center"><input type="checkbox" name="rigo1" value="1" /></td>
<td align="center"><input type="checkbox" name="rigo1" value="2" /></td>
<td align="center"><input type="checkbox" name="rigo1" value="3" /></td>
</tr>
<tr>
<td align="center" bgcolor="#999999"><input type="checkbox" name="rigo2cbh" value="cbh" onclick="checkAllrigo2(document.consform.rigo2);" /></td>
<td align="center"><input type="checkbox" name="rigo2" value="1" /></td>
<td align="center"><input type="checkbox" name="rigo2" value="2" /></td>
<td align="center"><input type="checkbox" name="rigo2" value="3" /></td>
</tr>
<tr>
<td align="center" bgcolor="#999999"><input type="checkbox" name="rigo3cbh" value="cbh" onclick="checkAllrigo3(document.consform.rigo3);" /></td>
<td align="center"><input type="checkbox" name="rigo3" value="1" /></td>
<td align="center"><input type="checkbox" name="rigo3" value="2" /></td>
<td align="center"><input type="checkbox" name="rigo3" value="3" /></td>
</tr>
</table>
</form>

Tutto funziona per le righe ma non ho idea di come andare avanti sulle colonne!!!