ver=Math.round(parseFloat(navigator.appVersion)*100);
ie=navigator.appName.toLowerCase().indexOf('microsoft') != -1;
opera=navigator.userAgent.toLowerCase().indexOf('opera') != -1;
win = navigator.userAgent.toLowerCase().indexOf('win') != -1;
mac = navigator.userAgent.toLowerCase().indexOf('mac') != -1;
macosx = navigator.userAgent.toLowerCase().indexOf('mac os x') != -1;
goodie = !opera && ie && ver >= 400 && win;
goodns = !opera && !ie && ver >= 450 && ver < 500 && win;
goodns67 = !opera && !ie && ver >= 500 & win;