The Availability Booking Calendar is a great Flash/PHP calendar script that can be used anywhere where booking and availability needs to be used. Availability Calendar has friendly user password protected administration area where you can change availability status for any date. You can set the colors that you want via the Settings section at your administration area. A simple HTML code is being generated in your administration area. All you need to do is to put that code into any valid web page - PHP, ASP, JSP, HTML, HTM, etc. and the availability calendar will appear on it.