JavaScript: OS detection

JavaScript: OS detection: "// This script sets OSName variable as follows: // 'Windows' for all versions of Windows // 'MacOS' for all versions of Macintosh OS // 'Linux' for all versions of Linux // 'UNIX' for all other UNIX flavors // 'Unknown OS' indicates failure to detect the OS var OSName='Unknown OS'; if (navigator.appVersion.indexOf('Win')!=-1) OSName='Windows'; if (navigator.appVersion.indexOf('Mac')!=-1) OSName='MacOS'; if (navigator.appVersion.indexOf('X11')!=-1) OSName='UNIX'; if (navigator.appVersion.indexOf('Linux')!=-1) OSName='Linux'; document.write('Your OS: '+OSName);"