Prototype.Browser = {
			IE:     !!(window.attachEvent && !window.opera),
			Opera:  !!window.opera,
			WebKit: document.childNodes && !document.all && !navigator.taintEnabled,
			Gecko:  (document.getBoxObjectFor != null),
			MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
		};

		Object.extend(Prototype.Browser, {
		     WebKit419: Prototype.Browser.WebKit && (Prototype.BrowserFeatures.XPath),
		     WebKit420: Prototype.Browser.WebKit && (!Prototype.BrowserFeatures.XPath),
		     IE6:      Prototype.Browser.IE && (typeof window.XMLHttpRequest == "undefined"),
		     IE7:      Prototype.Browser.IE && (typeof window.XMLHttpRequest == "object")
		});