var uA = navigator.userAgent;
     var aN = navigator.appName;
     var aV = parseInt(navigator.appVersion);
     var ie = (aN.indexOf('Micr') != -1);
     var mac = (uA.indexOf('Mac') != -1 || uA.indexOf('mac') != -1);

if (!mac) {
   if (ie) document.write("<Link Rel='stylesheet' Type='text/css' Href='style/winIE.css'>");
   else document.write("<Link Rel='stylesheet' Type='text/css' Href='style/winNS.css'>");
   }
else {
   if (ie) document.write("<Link Rel='stylesheet' Type='text/css' Href='style/macIE.css'>");
   else if (aN=='Netscape' && aV>4)  document.write("<Link Rel='stylesheet' Type='text/css' Href='style/macIE.css'>");
   else document.write("<Link Rel='stylesheet' Type='text/css' Href='style/macNS.css'>");
   }