Rullepanel i dette script

Hvordan tillader jeg at der er et rullepanel i højre side med dette script??


<script language="JavaScript">
<!-- Gem koden for gamle browsere

function PopWin(url,h,w) { var ww = 480, wh = 340, leftPos = null, topPos = null;

IE=(document.all)?true:false;
var wh = (IE)?document.body.clientHeight : window.innerHeight;
var ww = (IE)?document.body.clientWidth : window.innerWidth;

if (top.screen){
  if (screen.width){
    leftPos = Math.round((ww-w-10)/2);
    topPos = Math.round((wh-h-29)/2);
  } else {
    leftPos = 50
    topPos = 50
  }
}

popupWin = window.open(url, 'popup', 'height=' + h + ',width=' + w + ',top=' + topPos + ',left=' + leftPos + '')
}
// -->
</script>