ehm... allora... tieni il codice


<html>
<head>
<title>Untitled</title>
<script>
function visualizza() {



if (document.getElementById("s0").value=="2") {
document.getElementById("s1").style.visibility="vi sible";
document.getElementById("s2").style.visibility="vi sible";
} else {
document.getElementById("s1").style.visibility="hi dden";
document.getElementById("s2").style.visibility="hi dden";
}

if (document.getElementById("s0").value=="3") {
document.getElementById("s1").style.visibility="vi sible";
document.getElementById("s2").style.visibility="vi sible";
document.getElementById("s3").style.visibility="vi sible";
} else {
document.getElementById("s1").style.visibility="hi dden";
document.getElementById("s2").style.visibility="hi dden";
document.getElementById("s3").style.visibility="hi dden";
}




}
</script>
</head>

<body>
<select name="s0" id="s0" onchange="visualizza();">
<option value="0"></option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<input type=text name="torta1" id="s1" style="visibility:hidden">
<input type=text name="torta2" id="s2" style="visibility:hidden">
<input type=text name="torta3" id="s3" style="visibility:hidden">




appena seleziono 3, mi appaiono i 3 box, premo il 2, ne appaiono 2... e così via