var browser = "unknown";

if (navigator.platform.indexOf('Win')==0) {
		if (navigator.appName=="Netscape") {
			if (parseInt(navigator.appVersion) < 5) {
				//alert("Netscape 4 Windows");
				browser = "NS4WIN";
			}
			if (parseInt(navigator.appVersion) > 4) {
				//alert("Netscape 6 Windows");
				browser = "NS6WIN";
			}
		}
		if (navigator.appName.indexOf("Microsoft")!=-1) {
			var versionIndex = navigator.appVersion.indexOf("MSIE ") + 5;
			if (parseInt(navigator.appVersion.substr(versionIndex, 5)) == 4) {
				//alert("IE4 Windows");
				browser = "IE4WIN";
			}
			if (parseInt(navigator.appVersion.substr(versionIndex, 5)) == 5) {
				//alert("IE5 Windows");
				browser = "IE5WIN";
			}
			if (parseInt(navigator.appVersion.substr(versionIndex, 5)) == 6) {
				//alert("IE6 Windows");
				browser = "IE6WIN";
			}
		}
	}

	if (navigator.platform.indexOf('Mac')==0) {
		if (navigator.appName=="Netscape") {
			if (parseInt(navigator.appVersion) < 5) {
				//alert("Netscape 4 Mac");
				browser = "NS4MAC";
			}
			if (parseInt(navigator.appVersion) > 4) {
				//alert("Netscape 6 Mac");
				browser = "NS6MAC";
			}
		}
		if (navigator.appName.indexOf("Microsoft")!=-1) {
			var versionIndex = navigator.appVersion.indexOf("MSIE ") + 5;
			if (parseInt(navigator.appVersion.substr(versionIndex, 5)) == 4) {
				//alert("IE4 Mac");
				browser = "IE4MAC";
			}
			if (parseInt(navigator.appVersion.substr(versionIndex, 5)) == 5) {
				//alert("IE5 Mac");
				browser = "IE5MAC";
			}
			if (parseInt(navigator.appVersion.substr(versionIndex, 5)) == 6) {
				//alert("IE6 Mac");
				browser = "IE6MAC";
			}
		}
	}