var nm = navigator.appName.indexOf("Netscape") != -1;
	var vers = parseInt(navigator.appVersion);
	if (nm && (vers == 4)) {
	  document.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"nn4_default.css\">"); 
	}
	else {
	document.write ("<link rel=\"stylesheet\" type=\"text/css\" href=\"default.css\"  >")
 }