codice:
<html>
<head>
<title></title>
<script>
function SetState(obj_radio, obj_textarea)
{ if(parseInt(obj_radio.value))
{ obj_textarea.disabled = true;
}
else
{ obj_textarea.disabled = false;
}
}
</script>
</head>
<body>
<form name="form1" action="" method="post">
Abilita: <input type="radio" name="my_rad" value="0" onclick="SetState (this, this.form.my_text)" checked>
Disabilita: <input type="radio" name="my_rad" value="1" onclick="SetState(this, this.form.my_text)">
<textarea name="my_text"></textarea>
</form>
</body>
</html>