NS4 = (document.layers);
    IE4 = (document.all);
   ver4 = (NS4 || IE4);
    IE5 = (IE4 && navigator.appVersion.indexOf("5.")!=-1);
  isMac = (navigator.appVersion.indexOf("Mac") != -1);
 isMenu = (NS4 || (IE4 && !isMac) || (IE5 && isMac));
 function popUp(){return};
 function popDown(){return};
 if (!ver4) event = null;

 // If the platform is Macintosh, use the Macintosh style sheet.
 if (isMac) {
   document.write('<link rel="stylesheet" type="text/css" href="macstyles.css">');
   // Otherwise, use the Windows style sheet.
 } else{
   if (IE4) {
     document.write('<link rel="stylesheet" type="text/css" href="winstylesIE.css">');
   } else {
     document.write('<link rel="stylesheet" type="text/css" href="winstylesNN.css">');
   }
 }