codice:
<script language="JavaScript"> 
function prova () { 
var newWindow = window.open("" ,'newWindow','toolbar=no,location=center,diwindow.open("moduli/fax.asp" ,'apopup','toolbar=no,location=center,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,copyhistory=no,HEIGHT=410,WIDTH=530')} 
document.form1.target = "newWindow"
document.form1.submit()
</script> 
<form id=form1 name=form1 action="moduli/fax.asp" >

<input type="button" onclick="javascript: prova()" value="Visualizza"> 
</form >