<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>

cosi va!


hai dimenticato i doppi apici