// Browser Sniffer Object

function BrowserSniffer() {
   var agent = navigator.userAgent;
   var browserName = navigator.appName;
   var version = parseInt(navigator.appVersion)
   if (browserName == "Microsoft Internet Explorer") this.brows = "IE"
   else if (browserName == "Netscape") this.brows = "NN"
   else this.brows = browserName
   if (agent.indexOf('MSIE 5') != -1) this.ver = 5
   else this.ver = version
   this.IE = (this.brows == "IE" && this.ver >= 4)
   this.IE4 = (agent.indexOf('MSIE 4') != -1)
   this.IE5 = (agent.indexOf('MSIE 5') != -1)
   this.NN = (this.brows == "NN" && this.ver >= 4)
   this.NN4 = (this.brows == "NN" && this.ver == 4)
   this.NN5 = (this.brows == "NN" && this.ver == 5)
}

// creating instance of the browser sniffer object

var is = new BrowserSniffer()