browser = navigator.appName;
ie = "Microsoft Internet Explorer";
netscape = "Netscape";
os = navigator.platform;
mac = 'MacPPC'

if (browser == netscape && os != mac) { document.write('<link rel="stylesheet" type="text/css" href="http://www.acfcfc.org/includes/css/netscapepc.css">'); }
else if (browser == ie && os != mac) { document.write('<link rel="stylesheet" type="text/css" href="http://www.acfcfc.org/includes/css/iepc.css">'); 
}
else if (browser == netscape && os == mac) { document.write('<link rel="stylesheet" type="text/css" href="http://www.acfcfc.org/includes/css/netscapemac.css">'); }
else if (browser == ie && os == mac) { document.write('<link rel="stylesheet" type="text/css" href="http://www.acfcfc.org/includes/css/iemac.css">'); 
}