function linkCSS(ieCSS, nsCSS) {
  browser_version = parseInt(navigator.appVersion);
  browser_type = navigator.appName;

  var cssFN = null;
  var isIE = true;

  if (browser_type == "Microsoft Internet Explorer" && (browser_version >= 4)) {
    cssFN = ieCSS;
    isIE = true;
  } else if (browser_type == "Netscape" && (browser_version >= 4)) {
    cssFN = nsCSS;
    isIE = false;
  }
  document.write('<link rel="STYLESHEET" type="text/css" href="'+cssFN+'" media="screen">');
  return isIE;      
}