var client = function() {
	// rendering engines
	var engine = {
		ie : 0,
		gecko : 0,
		webkit : 0,
		khtml : 0,
		opera : 0,
		// complete version
		ver : null
	};
	// browsers
	var browser = {
		// browsers
		ie : 0,
		firefox : 0,
		safari : 0,
		konq : 0,
		opera : 0,
		chrome : 0,
		// specific version
		ver : null
	};
	// platform/device/OS3
	var system = {
		win : false,
		mac : false,
		x11 : false,
		// mobile devices
		iphone : false,
		ipod : false,
		ipad : false,
		ios : false,
		android : false,
		nokiaN : false,
		winMobile : false,
		// game systems
		wii : false,
		ps : false
	};
	// detect rendering engines/browsers
	var ua = navigator.userAgent;
	if (window.opera) {
		engine.ver = browser.ver = window.opera.version();
		engine.opera = browser.opera = parseFloat(engine.ver);
	} else if (/AppleWebKit\/(\S+)/.test(ua)) {
		engine.ver = RegExp["$1"];
		engine.webkit = parseFloat(engine.ver);
		// figure out if it’s Chrome or Safari
		if (/Chrome\/(\S+)/.test(ua)) {
			browser.ver = RegExp["$1"];
			browser.chrome = parseFloat(browser.ver);
		} else if (/Version\/(\S+)/.test(ua)) {
			browser.ver = RegExp["$1"];
			browser.safari = parseFloat(browser.ver);
		} else {
			// approximate version
			var safariVersion = 1;
			if (engine.webkit < 100) {
				safariVersion = 1;
			} else if (engine.webkit < 312) {
				safariVersion = 1.2;
			} else if (engine.webkit < 412) {
				safariVersion = 1.3;
			} else {
				safariVersion = 2;
			}
			browser.safari = browser.ver = safariVersion;
		}
	} else if (/KHTML\/(\S+)/.test(ua) || /Konqueror\/([^;]+)/.test(ua)) {
		engine.ver = browser.ver = RegExp["$1"];
		engine.khtml = browser.konq = parseFloat(engine.ver);
	} else if (/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua)) {
		engine.ver = RegExp["$1"];
		engine.gecko = parseFloat(engine.ver);
		// determine if it’s Firefox
		if (/Firefox\/(\S+)/.test(ua)) {
			browser.ver = RegExp["$1"];
			browser.firefox = parseFloat(browser.ver);
		}
	} else if (/MSIE ([^;]+)/.test(ua)) {
		engine.ver = browser.ver = RegExp["$1"];
		engine.ie = browser.ie = parseFloat(engine.ver);
	}
	// detect browsers
	browser.ie = engine.ie;
	browser.opera = engine.opera;
	// detect platform
	var p = navigator.platform;
	system.win = p.indexOf("Win") == 0;
	system.mac = p.indexOf("Mac") == 0;
	system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
	// detect windows operating systems
	if (system.win) {
		if (/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua)) {
			if (RegExp["$1"] == "NT") {
				switch (RegExp["$2"]) {
				case "5.0":
					system.win = "2000";
					break;
				case "5.1":
					system.win = "XP";
					break;
				case "6.0":
					system.win = "Vista";
					break;
				case "6.1":
					system.win = "7";
					break;
				default:
					system.win = "NT";
					break;
				}
			} else if (RegExp["$1"] == "9x") {
				system.win = "ME";
			} else {
				system.win = RegExp["$1"];
			}
		}
	}
	// mobile devices
	system.iphone = ua.indexOf("iPhone") > -1;
	system.ipod = ua.indexOf("iPod") > -1;
	system.ipad = ua.indexOf("iPad") > -1;
	system.nokiaN = ua.indexOf("NokiaN") > -1;
	// windows mobile
	if (system.win == "CE") {
		system.winMobile = system.win;
	} else if (system.win == "Ph") {
		if (/Windows Phone OS (\d+.\d+)/.test(ua)) {
			;
			system.win = "Phone";
			system.winMobile = parseFloat(RegExp["$1"]);
		}
	}
	// determine iOS version
	if (system.mac && ua.indexOf("Mobile") > -1) {
		if (/CPU (?:iPhone )?OS (\d+_\d+)/.test(ua)) {
			system.ios = parseFloat(RegExp.$1.replace("_", "."));
		} else {
			system.ios = 2; // can’t really detect - so guess
		}
	}
	// determine Android version
	if (/Android (\d+\.\d+)/.test(ua)) {
		system.android = parseFloat(RegExp.$1);
	}
	// gaming systems
	system.wii = ua.indexOf("Wii") > -1;
	system.ps = /playstation/i.test(ua);
	// return it
	return {
		engine : engine,
		browser : browser,
		system : system
	};
}();
