// Ultimate client-side JavaScript client sniff. 
// (C) Netscape Communications 1999.  Permission granted to reuse and distribute. 
// Revised 17 May 99 to add is_nav5up and is_ie5up (see below). 
// Everything you always wanted to know about your JavaScript client 
// but were afraid to ask. Creates "is_" variables indicating: 
// (1) browser vendor: 
//     is_nav, is_ie, is_opera 
// (2) browser version number: 
//     is_major (integer indicating major version number: 2, 3, 4 ...) 
//     is_minor (float   indicating full  version number: 2.02, 3.01, 4.04 ...) 
// (3) browser vendor AND major version number 
//     is_nav2, is_nav3, is_nav4, is_nav4up, is_nav5, is_nav5up, is_ie3, is_ie4, is_ie4up 
// (4) JavaScript version number: 
//     is_js (float indicating full JavaScript version number: 1, 1.1, 1.2 ...) 
// (5) OS platform and version: 
//     is_win, is_win16, is_win32, is_win31, is_win95, is_winnt, is_win98 
//     is_os2 
//     is_mac, is_mac68k, is_macppc 
//     is_unix 
//        is_sun, is_sun4, is_sun5, is_suni86 
//        is_irix, is_irix5, is_irix6 
//        is_hpux, is_hpux9, is_hpux10 
//        is_aix, is_aix1, is_aix2, is_aix3, is_aix4 
//        is_linux, is_sco, is_unixware, is_mpras, is_reliant 
//        is_dec, is_sinix, is_freebsd, is_bsd 
//     is_vms 
// 
// See http://www.it97.de/JavaScript/JS_tutorial/bstat/navobj.html and 
// http://www.it97.de/JavaScript/JS_tutorial/bstat/Browseraol.html 
// for detailed lists of userAgent strings. 
// 
// Note: you don't want your Nav4 or IE4 code to "turn off" or 
// stop working when Nav5 and IE5 (or later) are released, so 
// in conditional code forks, use is_nav4up ("Nav4 or greater") 
// and is_ie4up ("IE4 or greater") instead of is_nav4 or is_ie4 
// to check version in code which you want to work on future 
// versions. 

// convert all characters to lowercase to simplify testing 
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));
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_nav5 = (is_nav && (is_major == 5)); 
var is_nav5up = (is_nav && (is_major >= 5));
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); 
var is_ie3  = (is_ie && (is_major < 4)); 
var is_ie4  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")==-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_ie5up  = (is_ie  && !is_ie3 && !is_ie4); 

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

// *** JAVASCRIPT VERSION CHECK *** 
var is_js; 
if (is_nav2 || is_ie3) is_js = 1.0 
else if (is_nav3 || 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_nav5) is_js = 1.4 
// 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_nav && (is_major > 5)) is_js = 1.4 
else if (is_ie && (is_major > 5)) 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));

// 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);
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));