Tweak WP Plugin

Hello, I want the following changes in this Plugin: [login to view URL] 1. To be able to quickly change to Calendar to ID2 / ID3 / ID4 without having to reload the page. Probably AJAX might help. 2. To be able to select 1 item on Calendar ID1, another item on ID2, and so on .. on the same page, and the total to show all the items combined. This will definitely use a single Contact-form, to be filled only once. [Target: Customer books 1-RoomA -- 2-RoomB -- 1-RoomC and checks out in 1 go] 3. To display number of nights by the price (other than No. of Items) = Checkout date – Check-in date = No. of nights 4. To restrict the Number of Items (whether from a single room type only, or from a combination of Rooms) to 5. The backend can has as many as 100 items per room type, but on front-end user is to be restricted to a combination of 5 rooms no matter what Room types he choose. (Point # 2) 5. Optional: Integerate HIJRI calendar if possible. Since HIJRI calendar keeps varying by a single day, at the start of a month, we must give the option in the backend to fix the variation to the correct date.