浏览器用户代理的Javascript - 操作系统版本

Question

我有这个代码基于平台重定向。有没有办法在Macintosh上更具体？我需要按操作系统版本10.5,10.6,10.7等设置URLS

<script language="JavaScript">
if (navigator.userAgent.indexOf("iPhone")!=-1) window.location = "http://example.com/ios.html";
if (navigator.userAgent.indexOf("Windows NT 6.1")!=-1) window.location = "http://example.com/windows7.html";
if (navigator.userAgent.indexOf("Windows NT 5.1")!=-1) window.location = "http://example.com/windowsxp.html";
if (navigator.userAgent.indexOf("Macintosh")!=-1) window.location = "http://example.com/macos.html";
if (navigator.userAgent.indexOf("Linux")!=-1) window.location = "http://example.com/linux.html";
</script>