var isIE = false;
var isNS = false;
var browserName = navigator.appName;

if (browserName == "Netscape")
	isNS = true;
else
	isIE = true;

if (navigator.appVersion.slice(navigator.appVersion.indexOf('(')+1,navigator.appVersion.indexOf(')')).split(';')[1].indexOf('4') != -1) {
	is4 = true;
	//alert(is4)
} else {
	is4 = false;

}