Maximized popup in the Middle, doen't work!

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Hi!
im using this script:


<script type="text/javascript">
<!--
function popup(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,"sidan","top=" + parseInt(y/2-height/2-16-20) + ",left=" + parseInt(x/2-width/2-5) + ",x" + width + ",y" + height);
}
-->
</script>


to open a popup window wich is supposed to calculate the screen size and positon itself i the middle, i also wnat it to maximize and use the hole available screensize.

It works some times but not always, there's espessialy problems on widescreens (16:9) monitors like thoose on new notebooks!

can annyone help me?
om not that good at javascrip!

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/*
<script type="text/javascript">
<!--
function popup(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,"sidan","top=" + parseInt(y/2-height/2-16-20) + ",left=" + parseInt(x/2-width/2-5) + ",x" + width + ",y" + height);
}
-->
</script>
*/

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Here is the site:

http://www.nybergsglas.se

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Annyone???? HELP!!!!

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noone that can help?