Due : abilita.
Uno e tre : disabilitano
codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled</title>
<script language="JavaScript" type="text/javascript">
<!--
function test(value) {
if (value == '2') {
document.getElementById('t1').disabled = false;
document.getElementById('t2').disabled = false;
} else {
document.getElementById('t1').disabled = true;
document.getElementById('t2').disabled = true;
}
}
//-->
</script>
</head>
<body>
<select id="sel1" onchange="test(this.value)">
<option value="1">Uno</option>
<option value="2">Due</option>
<option value="3">Tre</option>
</select>
<input type="text" id="t1" disabled >
<input type="text" id="t2" disabled >
</body>
</html>