You were talking of adding extra columns to your table. Never change the structure of a table directly from your code. The moment you do that you're opening up the possiblity of corrupting it at some point or destroying something important. Structure changes to tables should only be done manually via phpmyadmin.
My helpful sig has gone because a mod below the administrator gave me an infraction - despite the administrator personally agreeing to it.
If you need any php tips or tricks you can PM me.