io pensavo ad una cosa del genere
codice:
<html> 
<head> 
<title>Login</title> 

<script>
function Apri(){
window.open ('login.htm', 'nuovafinlogin', 'buttons=no,scrollbars=yes,location=no,menubar=no,resizable=yes,status=no,directories=no,toolbar=no,height=400,width=700');
window.close()
}
<script>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> 
</head> 
<body bgcolor="#FFFFFF" onLoad="Apri()"> 
</body> 
</html>
ciao