mac = (navigator.appVersion.indexOf("Mac") != -1) ?true:false;
ie = (navigator.appName.charAt(0) == "M") ?true:false;
ns = (navigator.appName.charAt(0) == "N") ?true:false;

if (mac) {
      if (ie){
               fName = "css/text_macie.css";
              }
      else if (ns){
               fName = "css/text_macns.css";
              }
        }
else {
      if (ie){
               fName = "css/text_winie.css";
              }
      else if (ns){
               fName = "css/text_winns.css";
              }
     }
     
if (fName != null){
				   document.write("<LINK REL='stylesheet' HREF='"+fName+"' TYPE='text/css'>");
                  }