function BrowserDetect() 
{
   var ua = navigator.userAgent.toLowerCase(); 

   this.userAgent = navigator.userAgent;

   // browser engine name

   this.isGecko       = (ua.indexOf('gecko') != -1 && ua.indexOf('safari') == -1);
   this.isAppleWebKit = (ua.indexOf('applewebkit') != -1);

   // browser name

   this.browserName   = '';

   this.isKonqueror   = (ua.indexOf('konqueror') != -1); 
   
   if (this.isKonqueror)
   	this.browserName  = 'Konqueror';
   
   this.isSafari      = (ua.indexOf('safari') != - 1);

   if (this.isSafari)
   	this.browserName  = 'Safari';

   this.isOmniweb     = (ua.indexOf('omniweb') != - 1);

   if (this.isOmniweb)
   	this.browserName  = 'Omniweb';

   this.isOpera       = (ua.indexOf('opera') != -1); 

   if (this.isOpera)
   	this.browserName  = 'Opera';

   this.isIcab        = (ua.indexOf('icab') != -1); 

   if (this.isIcab)
   	this.browserName  = 'Icab';

   this.isAol         = (ua.indexOf('aol') != -1); 

   if (this.isAol)
   	this.browserName  = 'AOL';

   this.isIE          = (ua.indexOf('msie') != -1 && !this.isOpera && (ua.indexOf('webtv') == -1) ); 

   if (this.isIE)
   	this.browserName  = 'Microsoft IE';

   this.isMozilla     = (this.isGecko && ua.indexOf('gecko/') + 14 == ua.length);

   if (this.isMozilla)
   	this.browserName  = 'Mozilla';

   this.isFirebird    = (ua.indexOf('firebird/') != -1);

   if (this.isFirebird)
   	this.browserName  = 'Firebird';

   this.isFirefox    = (ua.indexOf('firefox/') != -1);

   if (this.isFirefox)
   	this.browserName  = 'Firefox';

   this.isNS          = ( (this.isGecko) ? (ua.indexOf('netscape') != -1) : ( (ua.indexOf('mozilla') != -1) && !this.isOpera && !this.isSafari && (ua.indexOf('spoofer') == -1) && (ua.indexOf('compatible') == -1) && (ua.indexOf('webtv') == -1) && (ua.indexOf('hotjava') == -1) ) );

   if (this.isNS)
   	this.browserName  = 'Netscape';
   
   // spoofing and compatible browsers

   this.isIECompatible = ( (ua.indexOf('msie') != -1) && !this.isIE);
   this.isNSCompatible = ( (ua.indexOf('mozilla') != -1) && !this.isNS && !this.isMozilla);
   
   // rendering engine versions

   this.geckoVersion = ( (this.isGecko) ? ua.substring( (ua.lastIndexOf('gecko/') + 6), (ua.lastIndexOf('gecko/') + 14) ) : -1 );
   this.equivalentMozilla = ( (this.isGecko) ? parseFloat( ua.substring( ua.indexOf('rv:') + 3 ) ) : -1 );
   this.appleWebKitVersion = ( (this.isAppleWebKit) ? parseFloat( ua.substring( ua.indexOf('applewebkit/') + 12) ) : -1 );
   
   // browser version

   this.versionMinor = parseFloat(navigator.appVersion); 
   
   // correct version number

   if (this.isGecko && !this.isMozilla && !this.isFirefox) 
   {
      this.versionMinor = parseFloat( ua.substring( ua.indexOf('/', ua.indexOf('gecko/') + 6) + 1 ) );
   }
   else if (this.isMozilla || this.isFirefox) 
   {
      this.versionMinor = parseFloat( ua.substring( ua.indexOf('rv:') + 3 ) );
   }
   else if (this.isIE && this.versionMinor >= 4) 
   {
      this.versionMinor = parseFloat( ua.substring( ua.indexOf('msie ') + 5 ) );
   }
   else if (this.isKonqueror) 
   {
      this.versionMinor = parseFloat( ua.substring( ua.indexOf('konqueror/') + 10 ) );
   }
   else if (this.isSafari) 
   {
      this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('safari/') + 7 ) );
   }
   else if (this.isOmniweb) 
   {
      this.versionMinor = parseFloat( ua.substring( ua.lastIndexOf('omniweb/') + 8 ) );
   }
   else if (this.isOpera) 
   {
      this.versionMinor = parseFloat( ua.substring( ua.indexOf('opera') + 6 ) );
   }
   else if (this.isIcab) 
   {
      this.versionMinor = parseFloat( ua.substring( ua.indexOf('icab') + 5 ) );
   }
   
   this.versionMajor = parseInt(this.versionMinor); 
   
   // dom support
   
   this.isDOM1 = (document.getElementById);
   this.isDOM2Event = (document.addEventListener && document.removeEventListener);
   
   // css compatibility mode
   
   this.mode = document.compatMode ? document.compatMode : 'BackCompat';

   // platform
   
   this.os = '';
   
   this.isWin    = (ua.indexOf('win') != -1);
   this.isWin95  = (this.isWin && ( ua.indexOf('95') != -1 ));
   
   if (this.isWin95)
   	this.os = 'Windows 95';
   
   this.isWin98  = (this.isWin && ( ua.indexOf('98') != -1 ));

   if (this.isWin98)
   	this.os = 'Windows 98';

   this.isWin32  = (this.isWin && ( ua.indexOf('95') != -1 || ua.indexOf('98') != -1 || ua.indexOf('nt') != -1 || ua.indexOf('win32') != -1 || ua.indexOf('32bit') != -1 || ua.indexOf('xp') != -1) );
   
   if (this.isWin32)
   	this.os = 'Windows 2000 oder höher';
   
   this.isMac    = (ua.indexOf('mac') != -1);

   if (this.isMac)
   	this.os = 'Mac';

   this.isUnix   = (ua.indexOf('unix') != -1 || ua.indexOf('sunos') != -1 || ua.indexOf('bsd') != -1 || ua.indexOf('x11') != -1)

   if (this.isUnix)
   	this.os = 'Unix';

   this.isLinux  = (ua.indexOf('linux') != -1);

   if (this.isLinux)
   	this.os = 'Linux';
   
   // specific browser shortcuts
   
   this.isNS4x = (this.isNS && this.versionMajor == 4);
   this.isNS40x = (this.isNS4x && this.versionMinor < 4.5);
   this.isNS47x = (this.isNS4x && this.versionMinor >= 4.7);
   this.isNS4up = (this.isNS && this.versionMinor >= 4);
   this.isNS6x = (this.isNS && this.versionMajor == 6);
   this.isNS6up = (this.isNS && this.versionMajor >= 6);
   this.isNS7x = (this.isNS && this.versionMajor == 7);
   this.isNS7up = (this.isNS && this.versionMajor >= 7);
   
   this.isIE4x = (this.isIE && this.versionMajor == 4);
   this.isIE4up = (this.isIE && this.versionMajor >= 4);
   this.isIE5x = (this.isIE && this.versionMajor == 5);
   this.isIE55 = (this.isIE && this.versionMinor == 5.5);
   this.isIE5up = (this.isIE && this.versionMajor >= 5);
   this.isIE6x = (this.isIE && this.versionMajor == 6);
   this.isIE6up = (this.isIE && this.versionMajor >= 6);
   
   this.isIE4xMac = (this.isIE4x && this.isMac);
}