function BrowserDetect() {
   var ua=navigator.userAgent.toLowerCase();
   // browser name
   this.isGecko= (ua.indexOf('gecko') != -1 && ua.indexOf('safari')==-1);
   this.isMozilla= (this.isGecko && ua.indexOf('gecko/') + 14==ua.length);
   this.isNS=((this.isGecko) ? (ua.indexOf('netscape') != -1) : ((ua.indexOf('mozilla') != -1) && (ua.indexOf('spoofer')==-1) && (ua.indexOf('compatible')==-1) && (ua.indexOf('opera')==-1) && (ua.indexOf('webtv')==-1) && (ua.indexOf('hotjava')==-1)));
   this.isIE=((ua.indexOf('msie') != -1) && (ua.indexOf('opera')==-1) && (ua.indexOf('webtv')==-1));
   this.isSafari=(ua.indexOf('safari') != - 1);
   this.isOpera=(ua.indexOf('opera') != -1);
   this.isKonqueror=(ua.indexOf('konqueror') != -1 && !this.isSafari);
   this.isIcab=(ua.indexOf('icab') != -1);
   this.isAol=(ua.indexOf('aol') != -1);
   // spoofing and compatible browsers
   this.isIECompatible=((ua.indexOf('msie') != -1) && !this.isIE);
   this.isNSCompatible=((ua.indexOf('mozilla') != -1) && !this.isNS && !this.isMozilla);
   this.versionMinor=parseFloat(navigator.appVersion); // browser version
   // correct version number
   if (this.isNS && this.isGecko) {this.versionMinor=parseFloat( ua.substring( ua.lastIndexOf('/') + 1 ));}
   else if (this.isIE && this.versionMinor >= 4) {this.versionMinor=parseFloat( ua.substring( ua.indexOf('msie ') + 5 ));}
   else if (this.isMozilla) {this.versionMinor=parseFloat( ua.substring( ua.indexOf('rv:') + 3 ));}
   else if (this.isSafari) {this.versionMinor=parseFloat( ua.substring( ua.lastIndexOf('/') + 1 ));}
   else if (this.isOpera) {if (ua.indexOf('opera/') != -1) {this.versionMinor=parseFloat( ua.substring( ua.indexOf('opera/') + 6 ));}else {this.versionMinor=parseFloat( ua.substring( ua.indexOf('opera ') + 6 )); }}
   else if (this.isKonqueror) {this.versionMinor=parseFloat( ua.substring( ua.indexOf('konqueror/') + 10 )); }
   else if (this.isIcab) {if (ua.indexOf('icab/') != -1) {this.versionMinor=parseFloat( ua.substring( ua.indexOf('icab/') + 6 ));}else {this.versionMinor=parseFloat( ua.substring( ua.indexOf('icab ') + 6 ));}}
   this.versionMajor=parseInt(this.versionMinor);
   this.geckoVersion=((this.isGecko) ? ua.substring((ua.lastIndexOf('gecko/') + 6), (ua.lastIndexOf('gecko/') + 14)) : -1 );
   // dom support
   this.isDOM1=(document.getElementById);
   this.isDOM2Event=(document.addEventListener && document.removeEventListener);
   // css compatibility mode
   this.mode=document.compatMode ? document.compatMode : 'BackCompat';
   // platform
   this.isWin=(ua.indexOf('win') != -1);
   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));
   this.isMac=(ua.indexOf('mac') != -1);
   this.isUnix=(ua.indexOf('unix') != -1||ua.indexOf('sunos') != -1||ua.indexOf('bsd') != -1||ua.indexOf('x11') != -1)
   this.isLinux=(ua.indexOf('linux') != -1);
}
var browser=new BrowserDetect();