Project: load data from database

I have one page that load data from database and has one next-button for load more data onclick. Currently it load more data within the first load from database. For example, if select from database has limit 20, it load more data, for example 4 new record, each time the next-button is cicked till loading the entire 20 record and cannot load new data if clicked. The page has another prev-button that I want to work on opposite direction when clicked. Tasks a) When click prev-button the page must show previous loaded data successivelly b) When click next-button, it must load new data directly from database when the first limit is reached Access I give FTP access. Access to database seems not needed, but if required I give access via phpmyadmin I prefer who can start immediately and can complete in one hour. It requires knowledge on jquery and php/mysql