var szBrowserUserAgent = navigator.userAgent; 
var szBrowser = "Unknown";
var nVersion = "-1";
var bBrowserIsTooOld = false;

if (szBrowserUserAgent.indexOf('Chrome') > -1) { 
	szBrowser = 'Chrome';
	var re  = new RegExp("Chrome/([0-9]{1,}[\.0-9]{0,})"); 
	if (re.exec(szBrowserUserAgent) != null) 
		nVersion = parseFloat( RegExp.$1 ); 
	if (nVersion < 4)
		bBrowserIsTooOld = true;
} else { 

	if (szBrowserUserAgent.indexOf('MSIE') > -1) { 
		szBrowser = 'Microsoft Internet Explorer';
		var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})"); 
		if (re.exec(szBrowserUserAgent) != null) 
			nVersion = parseFloat( RegExp.$1 ); 
		if (nVersion < 7)
			bBrowserIsTooOld = true;
	}

	if (szBrowserUserAgent.indexOf('Firefox') > -1) { 
		szBrowser = 'Firefox';
		var re  = new RegExp("Firefox/([0-9]{1,}[\.0-9]{0,})"); 
		if (re.exec(szBrowserUserAgent) != null) 
			nVersion = parseFloat( RegExp.$1 ); 
		if (nVersion < 3)
			bBrowserIsTooOld = true;
	}

	if (szBrowserUserAgent.indexOf('Safari') > -1) { 
		szBrowser = 'Safari';
		var re  = new RegExp("Version/([0-9]{1,}[\.0-9]{0,})"); 
		if (re.exec(szBrowserUserAgent) != null) 
			nVersion = parseFloat( RegExp.$1 ); 
		if (nVersion < 3)
			bBrowserIsTooOld = true;
	}

	if (szBrowserUserAgent.indexOf('Opera') > -1) { 
		szBrowser = 'Opera';
		var re  = new RegExp("Version/([0-9]{1,}[\.0-9]{0,})"); 
		if (re.exec(szBrowserUserAgent) != null) 
			nVersion = parseFloat( RegExp.$1 ); 
		if (nVersion < 9)
			bBrowserIsTooOld = true;
	}
}

if (bBrowserIsTooOld) {
	document.getElementById('divOldBrowser').style.display = 'block';
} else {
	document.getElementById('divOldBrowser').style.display = 'none';
}