Sniffer - What can JavaScript see

<script type="text/javascript">

   var agt=navigator.userAgent.toLowerCase();

   // *** BROWSER VERSION ***
   // Note: On IE5, these return 4, so use is_ie5up to detect IE5.
   var is_major = parseInt(navigator.appVersion);
   var is_minor = parseFloat(navigator.appVersion);

   // Note: Opera and WebTV spoof Navigator.  We do strict client detection.
   // If you want to allow spoofing, take out the tests for opera and webtv.
   var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
               && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
               && (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
   var is_nav2 = (is_nav && (is_major == 2));
   var is_nav3 = (is_nav && (is_major == 3));
   var is_nav4 = (is_nav && (is_major == 4));
   var is_nav4up = (is_nav && (is_major >= 4));
   var is_navonly      = (is_nav && ((agt.indexOf(";nav") != -1) ||
                         (agt.indexOf("; nav") != -1)) );
   var is_nav6 = (is_nav && (is_major == 5));
   var is_nav6up = (is_nav && (is_major >= 5));
   var is_gecko = (agt.indexOf('gecko') != -1);

   var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
   var is_ie3    = (is_ie && (is_major < 4));
   var is_ie4    = (is_ie && (is_major == 4) && (agt.indexOf("msie 5")==-1) );
   var is_ie4up  = (is_ie && (is_major >= 4));
   var is_ie5    = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) );
   var is_ie5_5  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.5") !=-1));
   var is_ie5up  = (is_ie && !is_ie3 && !is_ie4);
   var is_ie5_5up =(is_ie && !is_ie3 && !is_ie4 && !is_ie5);

   // KNOWN BUG: On AOL4, returns false if IE3 is embedded browser
   // or if this is the first browser window opened.  Thus the
   // variables is_aol, is_aol3, and is_aol4 aren't 100% reliable.
   var is_aol   = (agt.indexOf("aol") != -1);
   var is_aol3  = (is_aol && is_ie3);
   var is_aol4  = (is_aol && is_ie4);
   var is_aol5  = (agt.indexOf("aol 5") != -1);
   var is_aol6  = (agt.indexOf("aol 6") != -1);

   var is_opera = (agt.indexOf("opera") != -1);
   var is_opera2 = (agt.indexOf("opera 2") != -1 || agt.indexOf("opera/2") != -1);
   var is_opera3 = (agt.indexOf("opera 3") != -1 || agt.indexOf("opera/3") != -1);
   var is_opera4 = (agt.indexOf("opera 4") != -1 || agt.indexOf("opera/4") != -1);
   var is_opera5 = (agt.indexOf("opera 5") != -1 || agt.indexOf("opera/5") != -1);
   var is_opera5up = (is_opera && !is_opera2 && !is_opera3 && !is_opera4);

   var is_webtv = (agt.indexOf("webtv") != -1); 

   var is_TVNavigator = ((agt.indexOf("navio") != -1) || (agt.indexOf("navio_aoltv") != -1)); 
   var is_AOLTV = is_TVNavigator;

   var is_hotjava = (agt.indexOf("hotjava") != -1);
   var is_hotjava3 = (is_hotjava && (is_major == 3));
   var is_hotjava3up = (is_hotjava && (is_major >= 3));

   // *** JAVASCRIPT VERSION CHECK ***
   var is_js;
   if (is_nav2 || is_ie3) is_js = 1.0;
   else if (is_nav3) is_js = 1.1;
   else if (is_opera5up) is_js = 1.3;
   else if (is_opera) is_js = 1.1;
   else if ((is_nav4 && (is_minor <= 4.05)) || is_ie4) is_js = 1.2;
   else if ((is_nav4 && (is_minor > 4.05)) || is_ie5) is_js = 1.3;
   else if (is_hotjava3up) is_js = 1.4;
   else if (is_nav6 || is_gecko) is_js = 1.5;
   // NOTE: In the future, update this code when newer versions of JS
   // are released. For now, we try to provide some upward compatibility
   // so that future versions of Nav and IE will show they are at
   // *least* JS 1.x capable. Always check for JS version compatibility
   // with > or >=.
   else if (is_nav6up) is_js = 1.5;
   // NOTE: ie5up on mac is 1.4
   else if (is_ie5up) is_js = 1.3

   // HACK: no idea for other browsers; always check for JS version with > or >=
   else is_js = 0.0;

   // *** PLATFORM ***
   var is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
   // NOTE: On Opera 3.0, the userAgent string includes "Windows 95/NT4" on all
   //        Win32, so you can't distinguish between Win95 and WinNT.
   var is_win95 = ((agt.indexOf("win95")!=-1) || (agt.indexOf("windows 95")!=-1));

   // is this a 16 bit compiled version?
   var is_win16 = ((agt.indexOf("win16")!=-1) || 
              (agt.indexOf("16bit")!=-1) || (agt.indexOf("windows 3.1")!=-1) || 
              (agt.indexOf("windows 16-bit")!=-1) );  

   var is_win31 = ((agt.indexOf("windows 3.1")!=-1) || (agt.indexOf("win16")!=-1) ||
                   (agt.indexOf("windows 16-bit")!=-1));

   var is_winme = ((agt.indexOf("win 9x 4.90")!=-1));
   var is_win2k = ((agt.indexOf("windows nt 5.0")!=-1));

   // NOTE: Reliable detection of Win98 may not be possible. It appears that:
   //       - On Nav 4.x and before you'll get plain "Windows" in userAgent.
   //       - On Mercury client, the 32-bit version will return "Win98", but
   //         the 16-bit version running on Win98 will still return "Win95".
   var is_win98 = ((agt.indexOf("win98")!=-1) || (agt.indexOf("windows 98")!=-1));
   var is_winnt = ((agt.indexOf("winnt")!=-1) || (agt.indexOf("windows nt")!=-1));
   var is_win32 = (is_win95 || is_winnt || is_win98 || 
                   ((is_major >= 4) && (navigator.platform == "Win32")) ||
                   (agt.indexOf("win32")!=-1) || (agt.indexOf("32bit")!=-1));

   var is_os2   = ((agt.indexOf("os/2")!=-1) || 
                   (navigator.appVersion.indexOf("OS/2")!=-1) ||   
                   (agt.indexOf("ibm-webexplorer")!=-1));

   var is_mac    = (agt.indexOf("mac")!=-1);
   // hack ie5 js version for mac
   if (is_mac && is_ie5up) is_js = 1.4;
   var is_mac68k = (is_mac && ((agt.indexOf("68k")!=-1) || 
                              (agt.indexOf("68000")!=-1)));
   var is_macppc = (is_mac && ((agt.indexOf("ppc")!=-1) || 
                               (agt.indexOf("powerpc")!=-1)));

   var is_sun     = (agt.indexOf("sunos")!=-1);
   var is_sun4    = (agt.indexOf("sunos 4")!=-1);
   var is_sun5    = (agt.indexOf("sunos 5")!=-1);
   var is_suni86  = (is_sun && (agt.indexOf("i86")!=-1));
   var is_irix    = (agt.indexOf("irix") !=-1);    // SGI
   var is_irix5   = (agt.indexOf("irix 5") !=-1);
   var is_irix6   = ((agt.indexOf("irix 6") !=-1) || (agt.indexOf("irix6") !=-1));
   var is_hpux    = (agt.indexOf("hp-ux")!=-1);
   var is_hpux9   = (is_hpux && (agt.indexOf("09.")!=-1));
   var is_hpux10  = (is_hpux && (agt.indexOf("10.")!=-1));
   var is_aix     = (agt.indexOf("aix") !=-1);      // IBM
   var is_aix1    = (agt.indexOf("aix 1") !=-1);    
   var is_aix2    = (agt.indexOf("aix 2") !=-1);    
   var is_aix3    = (agt.indexOf("aix 3") !=-1);    
   var is_aix4    = (agt.indexOf("aix 4") !=-1);    
   var is_linux   = (agt.indexOf("inux")!=-1);
   var is_sco     = (agt.indexOf("sco")!=-1) || (agt.indexOf("unix_sv")!=-1);
   var is_unixware= (agt.indexOf("unix_system_v")!=-1); 
   var is_mpras   = (agt.indexOf("ncr")!=-1); 
   var is_reliant = (agt.indexOf("reliantunix")!=-1);
   var is_dec     = ((agt.indexOf("dec")!=-1) || (agt.indexOf("osf1")!=-1) || 
                     (agt.indexOf("dec_alpha")!=-1) || (agt.indexOf("alphaserver")!=-1) || 
                     (agt.indexOf("ultrix")!=-1) || (agt.indexOf("alphastation")!=-1)); 
   var is_sinix   = (agt.indexOf("sinix")!=-1);
   var is_freebsd = (agt.indexOf("freebsd")!=-1);
   var is_bsd     = (agt.indexOf("bsd")!=-1);
   var is_unix    = ((agt.indexOf("x11")!=-1) || is_sun || is_irix || is_hpux || 
                            is_sco ||is_unixware || is_mpras || is_reliant || 
                            is_dec || is_sinix || is_aix || is_linux || is_bsd ||
                            is_freebsd);
   var is_vms     = ((agt.indexOf("vax")!=-1) || (agt.indexOf("openvms")!=-1));

   document.write("
agt="+agt);
   document.write("
is_major="+is_major);
   document.write("
is_minor="+is_minor);
   document.write("
is_nav="+is_nav);
   document.write("
is_nav2="+is_nav2);
   document.write("
is_nav3="+is_nav3);
   document.write("
is_nav4="+is_nav4);
   document.write("
is_nav4up="+is_nav4up);
   document.write("
is_navonly="+is_navonly);
   document.write("
is_nav6="+is_nav6);
   document.write("
is_nav6up="+is_nav6up);
   document.write("
is_gecko="+is_gecko);
   document.write("
is_ie="+is_ie);
   document.write("
is_ie3="+is_ie3);
   document.write("
is_ie4="+is_ie4);
   document.write("
is_ie4up="+is_ie4up);
   document.write("
is_ie5="+is_ie5);
   document.write("
is_ie5_5="+is_ie5_5);
   document.write("
is_ie5up="+is_ie5up);
   document.write("
is_ie5_5up="+is_ie5_5up);
   document.write("
is_aol="+is_aol);
   document.write("
is_aol3="+is_aol3);
   document.write("
is_aol4="+is_aol4);
   document.write("
is_aol5="+is_aol5);
   document.write("
is_aol6="+is_aol6);
   document.write("
is_opera="+is_opera);
   document.write("
is_opera2="+is_opera2);
   document.write("
is_opera="+is_opera);
   document.write("
is_opera4="+is_opera4);
   document.write("
is_opera5="+is_opera5);
   document.write("
is_opera5up="+is_opera5up);
   document.write("
is_webtv="+is_webtv);
   document.write("
is_TVNavigator="+is_TVNavigator);
   document.write("
is_AOLTV="+is_AOLTV);
   document.write("
is_hotjava="+is_hotjava);
   document.write("
is_hotjava3="+is_hotjava3);
   document.write("
is_hotjava3up="+is_hotjava3up);
   document.write("
is_js="+is_js);
   document.write("
is_win="+is_win);
   document.write("
is_win95="+is_win95);
   document.write("
is_win16="+is_win16);
   document.write("
is_win31="+is_win31);
   document.write("
is_winme="+is_winme);
   document.write("
is_win2k="+is_win2k);
   document.write("
is_win98="+is_win98);
   document.write("
is_winnt="+is_winnt);
   document.write("
is_win32="+is_win32);
   document.write("
is_os2="+is_os2);
   document.write("
is_mac="+is_mac);
   document.write("
is_mac68k="+is_mac68k);
   document.write("
is_macppc="+is_macppc);
   document.write("
is_sun="+is_sun);
   document.write("
is_sun4="+is_sun4);
   document.write("
is_sun5="+is_sun5);
   document.write("
is_suni86="+is_suni86);
   document.write("
is_irix="+is_irix);
   document.write("
is_irix5="+is_irix5);
   document.write("
is_irix6="+is_irix6);
   document.write("
is_hpux="+is_hpux);
   document.write("
is_hpux9="+is_hpux9);
   document.write("
is_hpux10="+is_hpux10);
   document.write("
is_aix="+is_aix);
   document.write("
is_aix1="+is_aix1);
   document.write("
is_aix2="+is_aix2);
   document.write("
is_aix3="+is_aix3);
   document.write("
is_aix4="+is_aix4);
   document.write("
is_linux="+is_linux);
   document.write("
is_sco="+is_sco);
   document.write("
is_unixware="+is_unixware);
   document.write("
is_mpras="+is_mpras);
   document.write("
is_reliant="+is_reliant);
   document.write("
is_dec="+is_dec);
   document.write("
is_sinix="+is_sinix);
   document.write("
is_freebsd="+is_freebsd);
   document.write("
is_bsd="+is_bsd);
   document.write("
is_unix="+is_unix);
   document.write("
is_vms="+is_vms);

</script>