var is = new Is();

function Is() {
    var agent   = navigator.userAgent.toLowerCase();
    this.major  = parseInt(navigator.appVersion);
    this.minor  = parseFloat(navigator.appVersion);
    this.ns     = ((agent.indexOf('mozilla')   != -1) &&
                  (agent.indexOf('spoofer')    == -1) &&
                  (agent.indexOf('compatible') == -1) &&
                  (agent.indexOf('opera')      == -1) &&
                  (agent.indexOf('webtv')      == -1));
    this.ns4    = (this.ns && (this.major      ==  4));
    this.ns6    = (this.ns && (this.major      >=  5));
    this.ie     = (agent.indexOf("msie")       != -1);
    this.ie3    = (this.ie && (this.major      <   4));
    this.ie4  	= (this.ie && (this.major >= 4));
    this.ie5    = (this.ie && (this.major      ==  4) &&
                  (agent.indexOf("msie 5.0")   != -1));
    this.ieX    = (this.ie && !this.ie3 && !this.ie4);
}

// Browser Detect Lite  v2.1.4
// http://www.dithered.com/javascript/browser_detect/index.html
	
	function BrowserDetectLite() {
	   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);
	   
	   // browser version
	   this.versionMinor = parseFloat(navigator.appVersion); 
	   
	   // 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);
	   
	   // 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);
	}
	var browser = new BrowserDetectLite();