function getOSType(){
    var uAgent  = navigator.userAgent.toUpperCase();
    if (uAgent.indexOf("MAC") >= 0) return "Mac";
    if (uAgent.indexOf("WIN") >= 0) return "Win";
    if (uAgent.indexOf("X11") >= 0) return "UNIX";
    return "";
}
function getBrowserName(){
		var aName = navigator.appName.toUpperCase();
		var uName = navigator.userAgent.toUpperCase();
    if (aName.indexOf("NETSCAPE") >= 0) return "NN";
    if (aName.indexOf("EXPLORER") >= 0) return "IE";
		if (uName.lastIndexOf("OPERA") >= 0) return "OP";
		if (uName.indexOf("FIREFOX") >= 0) return "FF";
    return "";
}
function getBrowserVersion(){
	var browser = getBrowserName();
	var version = 0;
	var s = 0;
	var e = 0;
	var appVer  = navigator.appVersion;
	var uName = navigator.userAgent.toUpperCase();
	if (browser == "OP"){
		s = uName.indexOf("OPERA",0) + 6;
		e = uName.indexOf(" ",s);
		version = eval(uName.substring(s,e));
	}
	if (browser == "NN"){
		s = appVer.indexOf(" ",0);
		version = eval(appVer.substring(0,s));
	}
	if (browser == "IE"){
		s = appVer.indexOf("MSIE ",0) + 5;
		e = appVer.indexOf(";",s);
		version = eval(appVer.substring(s,e));
	}
	return version;
}

os      = getOSType();
browser = getBrowserName();
version = getBrowserVersion();
if ((os == "Mac") && (browser == "NN") && (version < 5))
{cssFile = "nn4.css";}
else if ((os == "Mac") && (browser == "NN") && (version >= 5))
{cssFile = "pixel2.css";}
else if ((os == "Mac") && (browser == "IE"))
{cssFile = "ie.css";}
else if ((os == "Mac") && (browser == "OP"))
{cssFile = "pixel2.css";}
else if ((os == "Win") && (browser == "NN") && (version < 5))
{cssFile = "nn4.css";}
else if ((os == "Win") && (browser == "OP"))
{cssFile = "win_op.css";}
else if ((os == "Win") && (browser == "IE"))
{cssFile = "ie.css";}
else
{cssFile = "pixel.css";}
document.write("<link href=\"http://www.tohoku-epco.co.jp/common/css/"+cssFile+"\" rel=\"stylesheet\" type=\"text/css\">");