if ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) < 4 ))
   {
     document.write("<LINK REL=stylesheet HREF=\"stylesheets/content.css\" TYPE=\"text/css\">");
   }
  else
     if ((navigator.appVersion.indexOf("Mac") != -1)) 
 
         if ((navigator.appName =="Netscape") && (parseInt(navigator.appVersion) < 5 ))
            {
             document.write("<LINK REL=stylesheet HREF=\"stylesheets/contentNN4.css\" TYPE=\"text/css\">");
             }
         else
            {
              document.write("<LINK REL=stylesheet HREF=\"stylesheets/content.css\" TYPE=\"text/css\">");
             }
    else
       {
        document.write("<LINK REL=stylesheet HREF=\"stylesheets/content.css\" TYPE=\"text/css\">");
    }