ua   = navigator.userAgent.toLowerCase();
saf  = (ua.indexOf("safari")    != -1);
nn4  = (document.layers);
if(saf){ // do this
document.writeln("<style type=\"text/css\">");
document.writeln("<!--");
document.writeln("#topnavi a,#botnavi a {font-size: 11px;}");
document.writeln("-->");
document.writeln("</style>");
}