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

if(!goodie) { window.location.replace("/vrml/notsupported/"); }