var ns4=(document.layers);
var Mac=(navigator.appVersion.indexOf('Mac')!=-1);
var dom = (document.getElementById);

if(ns4 && !Mac) document.write('<link rel="stylesheet" href="/css/ns4IBM.css" type="text/css">');
else if(ns4 && Mac) document.write('<link rel="stylesheet" href="/css/ns4Mac.css" type="text/css">');
else if(!ns4 && Mac && !dom) document.write('<link rel="stylesheet" href="/css/ie4Mac.css" type="text/css">');
else document.write('<link rel="stylesheet" href="/css/dom.css" type="text/css">');