Ecco un esempio.

file : test162b.html
codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
<script language="JavaScript" type="text/javascript">
<!--
function apriPopUp() {
 window.open("test162c.html","PopUp","menubar=yes,location=yes,resizable=yes,status=yes");
}
//-->
</script>

</head>
<body>
<table border="1">
<tr>
<td>Nome :</td><td id="ut_nome"></td>
</tr>
<tr>
<td>Cogome :</td><td id="ut_cognome"></td>
</tr>
<tr>
<td>Nick :</td><td id="ut_nick"></td>
</tr>
</table>


<input type="button" value="Clicca" onclick="apriPopUp()">
</body>
</html>
file : test162c.html
codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
<script language="JavaScript" type="text/javascript">
<!--
function convalida() {
 window.opener.document.getElementById('ut_nome').innerHTML = document.getElementById('nome').value;
 window.opener.document.getElementById('ut_cognome').innerHTML = document.getElementById('cognome').value;
 window.opener.document.getElementById('ut_nick').innerHTML = document.getElementById('nick').value;
 //
 window.close();
}
//-->
</script>

</head>
<body>
Nome : <input type="text" id="nome">


Cognome : <input type="text" id="cognome">


Nick : <input type="text" id="nick">


<input type="button" value="Clicca" onclick="convalida()">

</body>
</html>