function BrowserType()
{
	if ((navigator.appVersion.indexOf("Mac")!=-1)
			&& (navigator.userAgent.indexOf("MSIE")!=-1)
			&& (parseInt(navigator.appVersion)==3))
		this.ie3Mac = true;
	else {
	   // convert all characters to lowercase to simplify testing
		var agt=navigator.userAgent.toLowerCase();

		// Note: On IE5, these return 4, so use is.ie5up to detect IE5.
		this.major = parseInt(navigator.appVersion);
		this.minor = parseFloat(navigator.appVersion);
		this.opera = (agt.indexOf("opera") != -1);

		this.nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
					&& (agt.indexOf('compatible') == -1) && (! this.opera)
					&& (agt.indexOf('webtv')==-1));
		this.nav2 = (this.nav && (this.major == 2));
		this.nav3 = (this.nav && (this.major == 3));
		this.nav4 = (this.nav && (this.major == 4));
		this.nav4up = (this.nav && (this.major >= 4));
		this.navonly = (this.nav && ((agt.indexOf(";nav") != -1) ||
							  (agt.indexOf("; nav") != -1)) );
		this.nav5 = (this.nav && (this.major == 5));
		this.nav5up = (this.nav && (this.major >= 5));

		this.ie   = (agt.indexOf("msie") != -1);
		this.ie3  = (this.ie && (this.major < 4));
		this.ie4  = (this.ie && (this.major == 4) && (agt.indexOf("msie 5.0")==-1) );
		this.ie4up = (this.ie  && (this.major >= 4));
		this.ie5  = (this.ie && (this.major == 4) && (agt.indexOf("msie 5.0")!=-1) );
		this.ie5up  = (this.ie  && !this.ie3 && !this.ie4);
	}
}

var isBrowser;
isBrowser = new BrowserType();