la funzione è questa:

<script language="JavaScript">
function centerpopup(URL,width,height){
if (parseInt(navigator.appVersion) >= 3){
if (navigator.appName == "Netscape" && parseInt(navigator.appVersion)<5){
var tools = new Packages.java.awt.Toolkit.getDefaultToolkit();
screen=tools.getScreenSize();
}
x = screen.width;
y = screen.height;
}
window.open(URL,"dummy","top=" + parseInt(y/2-height/2-16) + ",left=" + parseInt(x/2-width/2-5) + ",width=" + width + ",height=" + height);
}
</script>


dove la metto la scritta scrollbars?