function browserVersion() {
	var agt = navigator.userAgent.toLowerCase();

	this.major = parseInt(navigator.appVersion);
	this.minor = parseFloat(navigator.appVersion);

	this.nav    = ((agt.indexOf('mozilla')!=-1) && ((agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible') == -1)));
	this.nav4up = this.nav && (this.major == 4);
	this.nav6 	= this.nav && (this.major >= 5);

	this.navonly = (this.nav && (agt.indexOf(";nav") != -1));

	this.ie     = (agt.indexOf("msie") != -1);
	this.ie4up  = this.ie  && (this.major >= 4);
	this.ie5up  = this.ie && (navigator.appVersion.indexOf('compatible; MSIE 5.0') != -1)

	this.opera = (agt.indexOf("opera") != -1);

	this.ver4up = (this.ie4up || this.nav4up );
}
var browserVersion = new browserVersion();