PHP Event Calendar

Hi, Im developing a website for my client and need an event calendar developed in php/mysql. In theory it would be similar to this [login to view URL] but with some variation. Ive attached a screenshot of the widget that will be on every page. Users need to be able to scroll months without reloading the page (ajax?). Dates that have event/s will be shaded a different colour. On hover, the name and time of the event will appear. On click, you go to a new page where the event/s for that day are listed down the page showing full detail. A small admin script needs to be developed where admins can add an event. (Login is taken care of, just need the script). When they add an event they need the fields - Name, date, time, description, price and a tick box if they can register online. If they have ticked the register online box, when you user sees the page with full detail about the event, a button "Register Now" needs to appear taking the user to a small registration form that asks for their name, email, address, number of people they are registering, phone, pay now or pay later and a comments field. If they have clicked pay now it needs to go to PayPal for credit card payment of registration fees, then back to a thank you page onsite. An email will then be generated to an admin email address showing registration details. I will help with integrating it into the existing site and admin area. Please provide examples of similar work you have done.