Dear V@no,
A few problems occur with this and I think it's because the "user" table holds information not just for the username and password, but user_lastaction, user_location, user_lastvisit, and user_comments, and this creats some problems as being kicked out if your are signed in and a few other little problems such as getting logged out if you go from one instance of 4images to the second instance of the 4images. Other problems like then "new images since last visit" will not work properly...and few little other things.
But, regardless....thanks again.