Add and fix functionality on PHP/MySQL/JQuery website

Hi I have [[login to view URL]][1] I want to add some functionlity. 1. I want to investigate why the page takes a long time to load, images are small. I think it is one of the JQuery libraries but you need to identify what one and then find and implement an alternative. 2. I also want to implement this <[login to view URL]> The database tables must be very optimised as there will be many messages, and you must create a complementory XML page so I can integrate this with an iPhone app. The facebook style messages also need to be flexable enough to show latest images etc. Users must also be able to add Aquariums to watch updates upon, such as the user comments, image additions, fish and coral, equipment additions. 3. I want to add an interface for recording results of water testing, the table exists but there is no input, update or delete. I would also like a google graph for this data. 4. At the moment users can add fish and corals and inverts to thier aquarium profile, at the moment they have to select from a pre defined list, I want this changed so they can add new items not in the list, but they must be approved by an admin before they are visible to everyone.