Html5 canvas with mysql intergretion and php content

I have a database which stores user login details in 1 table and has another table that stores a number of items dependant on the user. I need a html canvas that the user can place items upon, dependant on what they have available to them in the database. The locations of the assets need to be stored in the database so they are remembered for that user the next time the user logins. On each login it will need to check if new items (assets) are available to the user and allow them to place them. If assets are available some information will be shown if the user hovers over them The assets need to be clickable and load an overlay for more php content. Within these overlays choices can be made and data is sent by post, the overlay needs to update based upon the options chosen. Assets which are placed will have information appear when hovering over (i.e description etc). Some may need timers.