Hola
Prueba con esto
Código Javascript
:
Ver original<html>
<head>
<script type="text/javascript">
function funcion (chbox) {
for (var i=0;i < document.forms["f1"].elements.length;i++)
{
elemento = document.forms[0].elements[i];
if (elemento.type == "checkbox")
{
elemento.disabled = (document.forms["f1"].elements == chbox) ? chbox.checked : false;
}
}
}
</script>
</head>
<body>
<form name="f1">
<input type="radio" onclick="funcion(this)" name="bloquear">Activar
<input type="checkbox" name="c1" value="" disabled /><br />
<input type="checkbox" name="c2" value="" disabled /><br />
<input type="checkbox" name="c3" value="" disabled /><br />
<input type="checkbox" name="c4" value="" disabled />
</form>
</body>
</html>
Suerte