var NAV = "NN";

var agt = navigator.userAgent.toLowerCase();
     if (agt.indexOf("msie")    != -1) NAV =  'IE';
else if (agt.indexOf("firefox") != -1) NAV =  'FF';
else if (agt.indexOf("safari")  != -1) NAV =  'SF';
else if (agt.indexOf("opera")   != -1) NAV =  'OP';


var plf = navigator.platform;
     if (plf.indexOf("Win")     != -1) PLT = "Win";
else if (plf.indexOf("Mac")     != -1) PLT = "Mac";


/*
if (agt.indexOf("staroffice")  != -1) NAV =  'Star Office';
if (agt.indexOf("msie")        != -1) NAV =  'Internet Explorer';
if (agt.indexOf("netscape")    != -1) NAV =  'Netscape';
if (agt.indexOf("mozilla/5.0") != -1) NAV =  'Mozilla';
*/