Salve a tutti!

Dov'è che sbaglio?

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<html>
<head>
<title>Aiaoddiocomemesentomale v 3.3</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">

<script language="JavaScript">

function controlla() {
var d = document.Mioform.d1.value;

switch (d) {
case 1:
window.alert("Caso1!");
break;
case 2:
window.alert("Caso2!");
break;
case 3:
window.alert("Caso3!");
break;
case 4:
window.alert("Caso4!");
break;
default:
window.alert("Non funge!");
break;
}
}
</script>

<body>

<form name="Mioform" method="post" action="">
<input type="text" name="d1" value="">
<input type="button" value="Prova" onClick="controlla()">
</form>




</body>
</html>