apro la popup: <a href="#" onClick="popcentro('news_dettagli_cont.asp?id=...' ,'news','350','356')">

nella pagina della pop up(semplifico il codice):

<html>
<head>
<title>news</title>
<link href="xxx_style.css" rel="stylesheet" type="text/css" />
<style type="text/css">
<!--
html{
height:100%;
}

#Layer1 {
position:absolute;
width:320px;
height:240px;
z-index:1;
overflow: auto;
padding-right:10px;
}
-->
</style>
<script type="text/javascript">
<!--
function MM_reloadPage(init) { //reloads the window if Nav4 resized
if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);
//-->
</script>
</head>

<body onLoad="self.focus();">
<table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td><table width="100%" border="0" cellpadding="0" cellspacing="0" class="table1">
<tr>
<td valign="top" class="vuoto_bg"><h3>NEWS</h3>
<div id="Layer1"> contenuti qui</div>
</td>
</tr>
</table></td>
</tr>
</table>
</body>
</html>