prova questo
codice:
...
<head>
<script>
function enableSelect() {
document.getElementById('myselect').disabled = !document.getElementById('rbutt3').checked;
}
</script>
</head>
<body>
Opt1 <input type="radio" name="groupradio" value="opt1" id="rbutt1" onclick="enableSelect()" />
Opt2 <input type="radio" name="groupradio" value="opt2" id="rbutt2" onclick="enableSelect()" />
Opt3 [abilita select]<input type="radio" name="groupradio" value="opt3" id="rbutt3" onclick="enableSelect()" />
<select id="myselect" disabled="disabled">
<option>Select</option>
</select>
</body>
...
Ciao
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