var ie5 = document.all && document.getElementById;
var ns6 = document.getElementById && !document.all;
var bIE6 = ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) == 4));
var bNN6 = ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) == 5));

var bIE = navigator.appName == "Microsoft Internet Explorer";
var bNN = navigator.appName == "Netscape";