// 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_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));