var isMac		 	= navigator.appVersion.indexOf("Mac")!=-1 		? true : false;		// detect Mac OS
var isFireFox		= navigator.userAgent.indexOf("Firefox")!=-1 	? true : false;		// detect FireFox
var isSafari		= navigator.userAgent.indexOf("Safari")!=-1 	? true : false;		// detect Safari
var isNetscape		= navigator.appName == "Netscape"				? true : false;		// detect Netscape
var isIE			= document.all									? true : false;		// detect IE