Availability calendar java / prototype

Hi For my vacation rental website I need Availability calendar. Calendar should be editable from my website by registered customers. After the Client login to his account and go to “Edit Calendar” there he must be able make changes to his calendar – mark Unavailable days ( or month) or clear information. After “Save" button all changes must be save and visible at my website at the clients page. Client must has an opportunity to implement the calendar (result of changes) to his website – to show the same calendar. The perfect samples – www-flipkey-com (or homeaway-com) Important - You have to use Java/ prototype only!!!! See pictures in attachment.