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",
			versionSearch: "Version"
		},
		{
			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: "Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.userAgent,
			subString: "iPhone",
			identity: "iPhone/iPod"
	    },
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();

// document.write("You're using " + BrowserDetect.browser + " " + BrowserDetect.version + " on " + BrowserDetect.OS + ".");
// document.write("<br /><br />");

var ver = parseInt(BrowserDetect.version);
var note = 'This site is best viewed with Internet Explorer 7+, Firefox 3, Safari 4 and Chrome 2. ';
var linkStyle = 'onmouseover="this.style.textDecoration=underline;" onmouseout="this.style.textDecoration=none;"';
	
if (BrowserDetect.browser=="Internet Explorer" && ver<=6) {
	document.write('<div id="browser-wrapper"><div id="browser-alert">' + note + ' Click <a href="http://www.microsoft.com/windows/internet-explorer/ie7/" ' + linkStyle + '>here</a> to upgrade.</div></div>');
} 
else if (BrowserDetect.browser=="Firefox" && ver<=2) {
	document.write('<div id="browser-wrapper"><div id="browser-alert">' + note + ' Click <a href="http://www.firefoxdownload.com/" ' + linkStyle + '>here</a> to upgrade.</div></div>');
} 
else if (BrowserDetect.browser=="Safari" && ver<=3) {
	document.write('<div id="browser-wrapper"><div id="browser-alert">' + note + ' Click <a href="http://www.apple.com/safari/download/" ' + linkStyle + '>here</a> to upgrade.</div></div>');
} 
else if (BrowserDetect.browser=="Chrome" && ver<=1) {
	document.write('<div id="browser-wrapper"><div id="browser-alert">' + note + ' Click <a href="http://www.google.com/chrome" ' + linkStyle + '>here</a> to upgrade.</div></div>');
} 
else if (BrowserDetect.browser=="OmniWeb" || BrowserDetect.browser=="Opera" || BrowserDetect.browser=="iCab" || BrowserDetect.browser=="Camino" || BrowserDetect.browser=="Konqueror") {
	document.write('<div id="browser-wrapper"><div id="browser-alert">' + note + '</div></div>');
}