var browserVersion = parseInt(navigator.appVersion);
var NC;
var	W3;
var IE;
/*var MacIE;
var MacIE4;
var MacIE5;*/
if (browserVersion >= 4) {
  NC = (navigator.appName.indexOf('Netscape') != -1 && parseInt(navigator.appVersion) < 5) ? true : false;
// netscape 6:
//  W3_ns6 = (W3 && navigator.userAgent.indexOf('Netscape6') >= 0) ? true : false;
	W3 = (document.getElementById && navigator.appName.indexOf('Microsoft') == -1) ? true : false;
// internet explorer:
	IE = (document.all) ? true : false;
//	MacIE = (navigator.platform.indexOf('Mac') >= 0 && navigator.appName.indexOf('Microsoft') >= 0) ? true : false;
// sometimes, Macs IE 4 isn't able to do anything...
//	MacIE4 = (MacIE && navigator.appVersion.indexOf('5.') == -1) ? true : false;
//	MacIE5 = (MacIE && navigator.appVersion.indexOf('5.') >= 0) ? true : false;
}