<form method="post" action="selezione.php?nome=<? print ("$nome"); ?>" target="miaPop" onsubmit="Popup('miaPop')">

<script type="text/javascript">
<!--
var stile = "top=10, left=10, width=640, height=480, status=no, menubar=no, toolbar=no scrollbar=yes";
function Popup(apri) {
window.open("", apri, stile);
}
//-->
</script>

ciao