/////////////////////////////////////////////////////////////////////////////
// Browser Check Object
//
// (C) Alexander Schilling, 25. März 2000
// Available at http://powerwelt.de/
/////////////////////////////////////////////////////////////////////////////

// data for the js versions came from
// http://screenexa.net/js_notiz/tips/navigator.htm
// http://www.it97.de/JavaScript/JS_tutorial/bstat/navobj.html

var is; // Object to save the information into

/////////////////////////////////////////////////////////////////////////////
// BrowserCheckInit will start initializing the 'is' object if this isn't
// allready done
//
function BrowserCheckInit() {
  if(!is) is = new BrowserCheck();
}

/////////////////////////////////////////////////////////////////////////////
// BrowserCheck reads the information and saves it to the current object
//
function BrowserCheck() {
  // convert all characters to lowercase to simplify testing 
  var agt = navigator.userAgent.toLowerCase();



  // *** BROWSER VERSION *** 
  // Note: On some IE5, these return 4, so use this.ie5up to detect IE5. 
  this.major = parseInt(navigator.appVersion); 
  this.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. 
  this.nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1) 
              && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1) 
              && (agt.indexOf('webtv')==-1)); 
  this.nav2    = (this.nav && (this.major == 2)); 
  this.nav3    = (this.nav && (this.major == 3)); 
  this.nav3up  = (this.nav && (this.major >= 3)); 
  this.nav4    = (this.nav && (this.major == 4)); 
  this.nav4up  = (this.nav && (this.major >= 4)); 
  this.navonly = (this.nav && ((agt.indexOf(";nav") != -1) || (agt.indexOf("; nav") != -1)) ); 
  this.nav5    = (this.nav && (this.major == 5)); 
  this.nav5up  = (this.nav && (this.major >= 5)); 
  this.nav6    = (this.nav && (this.major == 6)); 
  this.nav6up  = (this.nav && (this.major >= 6)); 

  this.ie    = (agt.indexOf("msie") != -1); 
  this.ie3   = (this.ie && (this.major < 4)); 
  this.ie4   = (this.ie && (this.major == 4) && (agt.indexOf("msie 5.0")==-1) ); 
  this.ie4up = (this.ie && (this.major >= 4)); 
  this.ie5   = (this.ie && (this.major == 4) && (agt.indexOf("msie 5.0")!=-1) ); 
  this.ie5up = (this.ie && !this.ie3 && !this.ie4); 

  // KNOWN BUG: On AOL4, returns false if IE3 is embedded browser 
  // or if this is the first browser window opened.  Thus the 
  // variables this.aol, this.aol3, and this.aol4 aren't 100% reliable. 
  this.aol   = (agt.indexOf("aol") != -1); 
  this.aol3  = (this.aol && this.ie3); 
  this.aol4  = (this.aol && this.ie4); 

  this.opera = (agt.indexOf("opera") != -1); 
  this.webtv = (agt.indexOf("webtv") != -1); 




  // *** JAVASCRIPT VERSION CHECK *** 
  this.js; 
  if (this.nav2 || this.ie3) this.js = 1.0 
  else if (this.nav3 || this.opera) this.js = 1.1 
  else if ((this.nav4 && (this.minor <= 4.05)) || this.ie4) this.js = 1.2 
  else if ((this.nav4 && (this.minor  > 4.05)) || this.ie5) this.js = 1.3 
  else if (this.nav5) this.js = 1.4 
  else if (this.nav6) this.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 (this.nav && (this.major > 5)) this.js = 1.5 
  else if (this.ie  && (this.major > 5)) this.js = 1.3 
  // HACK: no idea for other browsers; always check for JS version with > or >= 
  else this.js = 1.0; 



  // *** PLATFORM ***
  this.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.
  this.win95 = ((agt.indexOf("win95")!=-1) || (agt.indexOf("windows 95")!=-1));

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

  this.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".
  this.win98 = ((agt.indexOf("win98")!=-1) || (agt.indexOf("windows 98")!=-1));
  this.winnt = ((agt.indexOf("winnt")!=-1) || (agt.indexOf("windows nt")!=-1) || (agt.indexOf("NT4.0")!=-1));
  this.win32 = (this.win95 || this.winnt || this.win98 || 
                    ((this.major >= 4) && (navigator.platform == "Win32")) ||
                    (agt.indexOf("win32")!=-1) || (agt.indexOf("32bit")!=-1));

  this.os2   = ((agt.indexOf("os/2")!=-1) || 
                    (navigator.appVersion.indexOf("OS/2")!=-1) ||   
                    (agt.indexOf("ibm-webexplorer")!=-1));

  this.mac    = (agt.indexOf("mac")!=-1);
  this.mac68k = (this.mac && ((agt.indexOf("68k")!=-1) || 
                                  (agt.indexOf("68000")!=-1)));
  this.macppc = (this.mac && ((agt.indexOf("ppc")!=-1) || 
                                  (agt.indexOf("powerpc")!=-1)));

  this.sun   = (agt.indexOf("sunos")!=-1);
  this.sun4  = (agt.indexOf("sunos 4")!=-1);
  this.sun5  = (agt.indexOf("sunos 5")!=-1);
  this.suni86= (this.sun && (agt.indexOf("i86")!=-1));
  this.irix  = (agt.indexOf("irix") !=-1);    // SGI
  this.irix5 = (agt.indexOf("irix 5") !=-1);
  this.irix6 = ((agt.indexOf("irix 6") !=-1) || (agt.indexOf("irix6") !=-1));
  this.hpux  = (agt.indexOf("hp-ux")!=-1);
  this.hpux9 = (this.hpux && (agt.indexOf("09.")!=-1));
  this.hpux10= (this.hpux && (agt.indexOf("10.")!=-1));
  this.aix   = (agt.indexOf("aix") !=-1);      // IBM
  this.aix1  = (agt.indexOf("aix 1") !=-1);    
  this.aix2  = (agt.indexOf("aix 2") !=-1);    
  this.aix3  = (agt.indexOf("aix 3") !=-1);    
  this.aix4  = (agt.indexOf("aix 4") !=-1);    
  this.linux = (agt.indexOf("inux")!=-1);
  this.sco   = (agt.indexOf("sco")!=-1) || (agt.indexOf("unix_sv")!=-1);
  this.unixware = (agt.indexOf("unix_system_v")!=-1); 
  this.mpras    = (agt.indexOf("ncr")!=-1); 
  this.reliant  = (agt.indexOf("reliantunix")!=-1);
  this.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)); 
  this.sinix = (agt.indexOf("sinix")!=-1);
  this.freebsd = (agt.indexOf("freebsd")!=-1);
  this.bsd = (agt.indexOf("bsd")!=-1);
  this.unix  = ((agt.indexOf("x11")!=-1) || this.sun || this.irix || this.hpux || 
               this.sco ||this.unixware || this.mpras || this.reliant || 
               this.dec || this.sinix || this.aix || this.linux || this.bsd || this.freebsd);

  this.vms   = ((agt.indexOf("vax")!=-1) || (agt.indexOf("openvms")!=-1));



  // *** LANGUAGE ***
  this.language = this.ie ? navigator.browserLanguage : navigator.language;
  this.java = navigator.javaEnabled();
}