ok, i have this page were a user can change his account details, but at the moment it is using a textfield asking for the users username to select which row to edit in mysql. But I am getting pretty tired of that. so what i want to know is.
Is there a way to using a session to select the users id from the mysql and keep that.
(explain more here: user id, so the user does not have to put in his username every time he changes his account. like an invisible field where it is automatically filled with his id)

is there a way? oh and please tell me how to do it via PHP not some useless ASP or Coldfusion, JSP