var DOM = (document.getElementById) ? true : false;
var IE4 = (document.all) ? true : false;
var NS4 = (document.layers) ? true : false;
var NS6 = navigator.vendor == "Netscape6";
var FF = navigator.vendor == "Firefox";
if (!NS6 && !FF && navigator.product == "Gecko") NS6 = true;
var MAC = navigator.appVersion.indexOf("Macintosh")>-1;

//                          DOM IE4 NS4 NS6 FF
// Internet Explorer 4       -   X   -
// Internet Explorer 5.0     o   X   -          o = Supports DOM, but uses IE4 routines for performance
// Internet Explorer 5.5     o   X   -   -   -
// Internet Explorer 6.0     o   X   -
// Netscape 4                -   -   X
// Netscape 6.2              X   -   -   X   -
// Firefox 1                 X   -   -   -   X
// Safari (TODO)

//alert("DOM="+DOM+" IE4="+IE4+" NS4="+NS4+" NS6="+NS6+" FF="+FF+" MAC="+MAC);
if (IE4 && DOM) DOM = false; // Let IE5/6 use IE4 routines (for performance)

// Source: http://www.quirksmode.org/js/detect.html
// Browser name: BrowserDetect.browser 
// Browser version: BrowserDetect.version 
// OS name: BrowserDetect.OS 

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.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"
		},
		{	// 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.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();