if (navigator.appName.indexOf('Microsoft') > -1) {
	//explorer
	document.write('<LINK HREF="http://192.168.0.159/css/base_ie.css" REL="styleSheet" TYPE="text/css">');
} else {
	//netscape
	document.write('<LINK HREF="http://192.168.0.159/css/base_ns.css" REL="styleSheet" TYPE="text/css">');
}