function getOS(){
var uAgent= navigator.userAgent.toUpperCase();
if (uAgent.indexOf("MAC") >= 0) return "Mac";
if (uAgent.indexOf("WIN") >= 0) return "Win"; return "";}
function getB(){
var aName= navigator.appName.toUpperCase();
if (aName.indexOf("NETSCAPE") >= 0)return "bNs";
if (aName.indexOf("MICROSOFT") >= 0) return "bIe"; return "";}
function getBV(){
var browser = getB(); var version = 0; var s = 0; var e = 0; var appVer= navigator.appVersion;
if (browser == "bNs"){ s = appVer.indexOf(" ",0);
version = eval(appVer.substring(0,s));
if (version >= 5) version++;}
if (browser == "bIe"){ appVer= navigator.userAgent;
s = appVer.indexOf("MSIE ",0) + 5;
e = appVer.indexOf(";",s); version = eval(appVer.substring(s,e));} return version;}