//Macintosh           Å@->  MacOS
//Windows95/98/NT/2000  ->Å@Windows
//UNIX                  ->Å@UNIX
function getOSType()
{
    var uAgent  = navigator.userAgent.toUpperCase();
    if (uAgent.indexOf("MAC") >= 0) return "MacOS";
    if (uAgent.indexOf("WIN") >= 0) return "Windows";
    if (uAgent.indexOf("X11") >= 0) return "UNIX";
    return "";
}
//Netscape Navigator ->  Netscape
//Internet Explorer  ->Å@Explorer
function getBrowserName()
{
    var aName  = navigator.appName.toUpperCase();
    if (aName.indexOf("NETSCAPE") >= 0)  return "Netscape";
    if (aName.indexOf("MICROSOFT") >= 0) return "Explorer";
    if (aName.indexOf("OPERA") >= 0) return "Explorer";
    
    return "";
}
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++;
		
	} else if(browser == "Explorer"){
	
		//for opera
		if (navigator.appName.toUpperCase().indexOf("OPERA") >= 0){

			appVer  = navigator.userAgent;
			s = appVer.indexOf("Opera") + 6;
			e = appVer.indexOf(" ",s);
			var tmpVersion = eval(appVer.substring(s,e));
			if(parseInt(tmpVersion) > 5){
				version = 5;
			} else {
				version = tmpVersion;
			}
		} else {	
			appVer  = navigator.userAgent;
			s = appVer.indexOf("MSIE ",0) + 5;
			e = appVer.indexOf(";",s);
			version = eval(appVer.substring(s,e));
		}
	}
	
	return version;
}