<script language="javascript" type="text/javascript">
function check(){
var choice=myform.select.value;
if (choice=="yes"){
document.getElementById("mydiv").style.display="bl ock";
}else{
document.getElementById("mydiv").style.display="no ne";
}
}
</script>
<form method"post" action="youraction.asp" name="myform">
<input name="Nome" /> <input name="Cognome" />
<div style="display:none;" id="mydiv">
<input name="Nome2" /> <input name="Cognome2" />
</div>
<select name="select" onchange="check()">
<option value="">Seleziona</option>
<option value="yes">Sì</option>
<option value="No">No</option>
</select>
</form>
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