var nav = navigator.appName;
var isIE = (nav == "Microsoft Internet Explorer");
var isNav = (nav == "Netscape");

var ver;
if (isIE) {
  var indx = navigator.userAgent.indexOf("MSIE");
  if (indx == -1) {
    ver = parseInt(navigator.appVersion);
  }
  else {
    ver = parseInt(navigator.userAgent.substr(indx + 5, 1));
  }
}
else {
  ver = parseInt(navigator.appVersion);
}

document.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"style");	  
if (navigator.platform == "Win32") {
  document.write("win");
}
else {
  document.write("mac");
}
document.writeln(".css\">");