var vNum = navigator.appVersion.charAt(0);
var bName = navigator.appName.charAt(0);

var ua, mode;
ua = navigator.userAgent;

document.writeln("<style type='text/css'><!--");
if(navigator.appVersion.indexOf("Mac") > -1)
 {
 document.writeln('*{letter-spacing: -0.05em;}');
 }
 document.writeln("--></style>");