platform/browser redirects

[jarow]

How can I add platform redirect into the following code? I would basically like to say 1) if ie and mac use xtilo_ie.css, 2) if you are netscape and mac use xtilo

Many thanks

<script language="JavaScript"><!--

browser_version= parseInt(navigator.appVersion);
browser_type = navigator.appName;

if (browser_type == "Microsoft Internet Explorer" && (browser_version >= 4)) {
document.write("<STYLE type='text/css' media='screen'>@import '<?php echo $ruta; ?>xtilo_ie.css';</STYLE>");
}
else if (browser_type == "Netscape" && (browser_version >= 4)) {
document.write("<STYLE type='text/css' media='screen'>@import '<?php echo $ruta; ?>xtilo.css';</STYLE>");
}
// -->
</script>