getting data from two different tables problem

[eluser]haris244808[/eluser]
Ok firstly i have 2 tables

i insert a data to table 'files' from the input->post, except that in came from i insert the user_id from the session (which i setted when the user logged in)....

now i want to show all the 'files' data together with the 'users' first_name and last_name but depending from the came_from field....