var IE = "<LINK REL='stylesheet' TYPE='text/css' HREF='/idol_site/free/css/ie.css'>"
var NC = "<LINK REL='stylesheet' TYPE='text/css' HREF='/idol_site/free/css/nc.css'>"

if(navigator.appName.charAt(0) == "N") {

document.write(NC);
}

if(navigator.appName.charAt(0) == "M") {

document.write(IE);
}