var win=1;
var mac=2;
var linux=3;

var nn=1;
var ie=2;
var opera=3;

var browservar=nn;
var versionvar=4;
var platformvar=win;

if (navigator.appName.indexOf('Netscape') != -1)
     {browservar=nn;}
else if
(navigator.appName.indexOf('Explorer') != -1)
     {
     browservar=ie;
     }
else if
 (navigator.userAgent.indexOf('Opera') != -1)
     {browservar=opera;}

versionvar = navigator.appVersion.substring(0,1);

if (navigator.platform.indexOf('Win') != -1)
     {platformvar=win;}

else if (navigator.platform.indexOf('Mac') != -1)
     {platformvar=mac;}

else if (  (navigator.platform.indexOf('Linux') != -1) || (navigator.platform.indexOf('X11') != -1)  )
     {platformvar=linux;}