Detect a kind of browser and version

var isIE=false;		//Internet Explorer
var isNS=false;		//Netscape Navigator
var isOpera=false;	//Opera
var isFireFox=false;	//Firefox
var isSafari=false;	//Safari
var appVer;
 
/*
 * detect browser name and version
 * @version 1.1
*/
function browserDetect(){
	var versionIndex=0;
	//Netscape & FireFox
	if(navigator.appName=="Netscape"){	// Mozilla Group
		//FireFox
		if(navigator.userAgent.indexOf("Firefox")!=-1){		
			isFireFox = true;
			versionIndex=navigator.userAgent.indexOf("Firefox")+8;
			appVer = parseInt(navigator.userAgent.charAt(versionIndex));
		//Nescape Navigator	
		}else if(navigator.userAgent.indexOf("Navigator")!=-1){
			isNS = true;
			versionIndex = navigator.userAgent.indexOf("Navigator")+10;
			appVer = parseFloat(navigator.userAgent.charAt(versionIndex));	
		}else if(navigator.userAgent.indexOf("Safari")!=-1){
			isSafari = true;
			versionIndex = navigator.userAgent.indexOf("Version")+8;
			appVer = parseInt(navigator.userAgent.charAt(versionIndex));
		}//end if~else
 
	//IE
	}else if(navigator.appName=="Microsoft Internet Explorer"){
		isIE = true;
		var temp;
		if (navigator.appVersion.indexOf("MSIE")!=-1){
			temp=navigator.appVersion.split("MSIE");
			appVer=parseFloat(temp[1]);
		}//end if
 
	//Opera?
	}else if(navigator.appName=="Opera"){
		isOpera = true;
		appVer = paraseFloat(navigator.appVersion);
 
	}
 
}