var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{ 	string: navigator.userAgent,
			subString: "Chrome",
			identity: "Chrome"
		},
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "OmniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "Safari"
		},
		{
			prop: window.opera,
			identity: "Opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "iCab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "Konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "Firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "Camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "Netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "Internet Explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "Mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "Old Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();

// now do something! 

if ((BrowserDetect.OS == "Windows") && (
(BrowserDetect.browser == "Internet Explorer" && BrowserDetect.version < 5) ||
(BrowserDetect.browser == "Opera" && BrowserDetect.version < 7) ||
(BrowserDetect.browser == "Netscape" && BrowserDetect.version < 7) ||
(BrowserDetect.browser == "Mozilla" && BrowserDetect.version < 1) ||
(BrowserDetect.browser == "Firefox" && BrowserDetect.version < 1) ||
(BrowserDetect.browser == "Old Netscape") ||
(BrowserDetect.browser == "An unknown browser")))
{ 
alert('Sorry, but your browser is not supported by this site! \n\n You\'re using ' + 
		BrowserDetect.browser + ' ' + BrowserDetect.version + ' on ' + BrowserDetect.OS + 
		'\n\n Supported Browsers for Windows: Internet Explorer 5.0+, Opera 7.0+, Netscape 7.0+, Mozilla 1.0+, FireFox 1.0+');

} 
else if ((BrowserDetect.OS == "Mac") && (
(BrowserDetect.browser == "Internet Explorer" && BrowserDetect.version < 5) ||
(BrowserDetect.browser == "Safari" && BrowserDetect.version < 1) ||
(BrowserDetect.browser == "Netscape" && BrowserDetect.version < 7) ||
(BrowserDetect.browser == "Mozilla" && BrowserDetect.version < 1) ||
(BrowserDetect.browser == "Opera" && BrowserDetect.version < 7) ||
(BrowserDetect.browser == "Firefox" && BrowserDetect.version < 1) ||
(BrowserDetect.browser == "Camino" && BrowserDetect.version < 0.8) ||
(BrowserDetect.browser == "Old Netscape") ||
(BrowserDetect.browser == "An unknown browser")))
{ 
alert('Sorry, but your browser is not supported by this site! \n\n You\'re using ' + 
		BrowserDetect.browser + ' ' + BrowserDetect.version + ' on ' + BrowserDetect.OS + 
		'\n\n Supported Browsers for Mac: Internet Explorer 5.1+, Safari 1.0+, Netscape 7.0+, Mozilla 1.0+, Opera 7.0+, Firefox1.0+, Camino 0.8+');
} 
else if ((BrowserDetect.OS == "Linux") && (
(BrowserDetect.browser == "Netscape" && BrowserDetect.version < 7) ||
(BrowserDetect.browser == "Mozilla" && BrowserDetect.version < 1) ||
(BrowserDetect.browser == "Opera" && BrowserDetect.version < 7) ||
(BrowserDetect.browser == "Konqueror" && BrowserDetect.version < 3) ||
(BrowserDetect.browser == "Firefox" && BrowserDetect.version < 1) ||
(BrowserDetect.browser == "Old Netscape") ||
(BrowserDetect.browser == "An unknown browser")))
{ 
alert('Sorry, but your browser is not supported by this site! \n\n You\'re using ' + 
		BrowserDetect.browser + ' ' + BrowserDetect.version + ' on ' + BrowserDetect.OS + 
		'\n\n Supported Browsers for Linux: Netscape 7.0+, Mozilla 1.0+, Opera 7.0+, Konqueror 3.0+, FireFox 1.0+');
} 


if (document.getElementById || document.all || document.layers)
{

} else
{
alert('Sorry, but your browser is not supported DHTML! \n\n Please check your browser\'s security settings\n\n You\'re using ' + 
		BrowserDetect.browser + ' ' + BrowserDetect.version + ' on ' + BrowserDetect.OS);
}