aName = navigator.appName.toUpperCase();
if (aName.indexOf("EXPLORER") >= 0) fName = "common/css/ie_main.css";
if (aName.indexOf("NETSCAPE") >= 0) fName = "common/css/nn_main.css";
document.write("<link rel='stylesheet' href='"+fName+"' type='text/css'>");

//document.write("<link rel='stylesheet' href='common/css/nn_main.css' type='text/css'>");