napr.
<script language="JavaScript">
<!--
function news()
{
window.open("url-otvirane-stranky.html","news",
"top=0,left=0,menubar=no,directories=no,"+
"toolbar=no,resizable=no,width=400,height=350,scrollbars=no,location=no,status=no");
}
// -->
</script>
a pak do <body> pridej <body onload=news()>
...ale nedelal bych to, stejne to polovina lidi blokuje :-)