<html>
<head>
<script type="text/javascript">
function checkedAll(totalchecks)
{
for(i=1;i<=totalchecks;i++)
{
document.getElementById('check'+i).checked=documen t.getElementById('checkall').checked;
(document.getElementById('check'+ i).checked==true)?document.getElementById('text'+ i).value=i:document.getElementById('text'+i).value =0;
}
}
function calcular(check,id)
{
(document.getElementById(check+id).checked== true)?document.getElementById('text'+id).value=id: document.getElementById('text'+id).value=0;
}
</script>
</head>
<body>
<?
Cita: $cont = 1;
foreach($fv as $field)
{
echo $field[nom_volcan]."<input type='checkbox' name='check$cont' id ='check$cont' value='vol_actividad$cont' onclick='calcular('check','$cont')'>";
echo "<input name ='text1$cont' type='text' id ='text1$cont' value='0'/>";
$cont++;
}
$totalcheck="4";//quitarias esto
?>
<form action="respueta.php" method="post" name="uno" id="uno">
<p>
<input name="check1" type='checkbox' id="check1" onclick='calcular("check","1")'/>
Cambia Value del checkbox:
<input name="text1" type="text" id="text1" />
//etc los demas check
</p>
//cambiarias esto
<input type='checkbox' name='checkall' id="checkall" onclick='checkedAll(<?echo $totalcheck?>);'/>
//por esto
<input type='checkbox' name='checkall' id="checkall" onclick='checkedAll(<?echo $cont?>);'/>
</form>
</body>
</html>