// JavaScript Document
//　Netscape Navigator ->  Netscape
//　Internet Explorer  ->　Explorer

function getBrowserName()
{
    var aName  = navigator.appName.toUpperCase();
    var uName  = navigator.userAgent.toUpperCase();
    if (aName.indexOf("NETSCAPE") >= 0)       return "Netscape";
    if (aName.indexOf("MICROSOFT") >= 0)      return "Explorer";
    return "";
}
//　ブラウザバージョン取得
function getBrowserVersion()
{
	var browser = getBrowserName();
	var version = 0;
	var s = 0;
	var e = 0;
	var appVer  = navigator.appVersion;
	if (browser == "Netscape")
	{
		s = appVer.indexOf(" ",0);
		version = eval(appVer.substring(0,s));
		if (version >= 5) version++;
	}
	if (browser == "Explorer")
	{
		appVer  = navigator.userAgent;
		s = appVer.indexOf("MSIE ",0) + 5;
		e = appVer.indexOf(";",s);
		version = eval(appVer.substring(s,e));
	}
	return version;
}
//　Macintosh           　->  MacOS
//　Windows95/98/NT/2000  ->　Windows
//　UNIX                  ->　UNIX
function getOSType()
{
    var RetCode = "";
    var uAgent  = navigator.userAgent.toUpperCase();
    if (uAgent.indexOf("MAC") >= 0)           RetCode = "MacOS";
    if (uAgent.indexOf("WIN") >= 0)           RetCode = "Windows";
    if (uAgent.indexOf("X11") >= 0)           RetCode = "UNIX";
    return RetCode;
}

function checkBrowser ()
{
	if (getBrowserName() == "Netscape"){
			if (getBrowserVersion() <6){
			location.href ="http://entree.jp/butbrowser.html";
			}
		}
	if (getBrowserName() == "Explorer"){
			if (getBrowserVersion()<6){
			location.href ="http://entree.jp/butbrowser.html";
			}
		}
}