browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
var agent = navigator.userAgent;
var ua = navigator.userAgent.toLowerCase();
var msie_ver = ua.charAt(ua.indexOf('msie')+5);

if (ua.indexOf('opera') != -1) {
	document.writeln("<link rel=stylesheet type=text/css href=\"common/css/op.css\">");
}
else if ((ua.indexOf('msie') != -1) && (msie_ver == 5)) { // IE 7.0
	document.writeln("<link rel=stylesheet type=text/css href=\"common/css/ie5_5.css\">");
}
else if ((ua.indexOf('msie') != -1) && (msie_ver == 6)) { // IE 7.0
	document.writeln("<link rel=stylesheet type=text/css href=\"common/css/ie6.css\">");
}
else if ((ua.indexOf('msie') != -1) && (msie_ver == 7)) { // IE 7.0
	document.writeln("<link rel=stylesheet type=text/css href=\"common/css/ie7.css\">");
}
else if ((browserVer >3) &&(browserName == "Netscape")) {
	document.writeln("<link rel=stylesheet type=text/css href=\"common/css/nn.css\">");
}