(function(){
	
	var insertMessage = function(){
	
		var 
			msg,
			domloaded,
			div = document.createElement('div'),
			bd = document.getElementById('bd') || document.getElementById('body'),
			browsers = {
				'MSIE': {
					'minversion': 7,
					'message': '<b>Hey there!</b> Your browser&#8217;s a little old these days. Please consider installing the <a href="http://code.google.com/chrome/chromeframe/">Google Chrome Frame</a> plug-in, or updating to the latest version of <a href="http://www.ie8optimized.com/IE8/">Internet Explorer</a>.'
				},
				'Firefox': {
					'minversion': 3.6,
					'message': '<b>Hey there!</b> Your browser&#8217;s a little old these days. Please consider installing the latest version of <a href="http://www.mozilla.com/en-US/firefox/upgrade.html">Firefox</a>.'
				}
			};
		
			div.style.border = '1px solid #933';
			div.style.backgroundColor = '#FCC';
			div.style.paddingTop = '9px';
			div.style.paddingLeft = '9px';
			div.style.paddingBottom = '9px';
			div.style.paddingRight = '9px';
			div.style.marginBottom = '20px';
			div.style.marginTop = '20px';
			
		if(BrowserDetect.browser in browsers){
			if( BrowserDetect.version < browsers[BrowserDetect.browser].minversion ){
				msg = browsers[BrowserDetect.browser].message;
				div.innerHTML = msg;
				bd.insertBefore(div, bd.children[0]);
			}
		}
	
	};

	if('Prototype' in window){
		domloaded = function (fn) { document.observe("dom:loaded",fn); };
	}else if('jQuery' in window){
		domloaded = jQuery;
	}else{
		domloaded = function (fn) { window.addEventListener('load', fn, false); };
	}

	domloaded(insertMessage);

	var BrowserDetect = window.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: "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();
}());