var sUserAgent = "";
var isOpera = false;
var isIE = false;
var isNS4 = false;

function detectBrowser(){
	sUserAgent = navigator.userAgent;
	isOpera = sUserAgent.indexOf("Opera") > -1;
	isKHTML = sUserAgent.indexOf("KHTML") > -1
		|| sUserAgent.indexOf("Konqueror") > -1
		|| sUserAgent.indexOf("AppleWebKit") > -1;
	
	isIE = sUserAgent.indexOf("compatible") > -1
		&& sUserAgent.indexOf("MSIE") > -1
		&& !isOpera;
	
	isFF = sUserAgent.indexOf("Gecko") > -1
		&& !isKHTML;
	
	isNS4 = !isIE && !isOpera && !isFF && !isKHTML
		&& (sUserAgent.indexOf("Mozilla") == 0)
		&& (navigator.appName == "Netscape");
}