代码如下:
<head>
<script language=javascript>
<!--
if ((navigator.appName == "Microsoft Internet Explorer") &&
(parseInt(navigator.appVersion) >= 4))
{
document.write('<link rel=stylesheet type="text/css" href="ie.css">')
}
else {document.write('<link rel=stylesheet type="text/css"
href="ns.css">')}
//-->
</script>
</head>
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