How to add users from column 1 to column 2 using codeigniter?

[eluser]Unknown[/eluser]
How to add users from column 1 to column 2 using codeigniter?
Column 1 has all the usernames and column 2 is the blank lines

Column1 (ALL USERS)#Column 2(MOderators) #

::Mark::::::::::::::::::::::_______:::
::JOhn::::::::::::::::::::::_______:::
::Xyz:::::::::::::::::::::::_______:::
::ABC::::::Add::::::::::::::_______:::
::you::::::Remove:::::::::::_______:::
::Me:::::::Undo:::::::::::::_______:::
::HIm:::::::::::::::::::::::_______:::
::WE::::::::::::::::::::::::_______:::
::123:::::::::::::::::::::::_______:::
::321:::::::::::::::::::::::_______:::

Save Option

There are two columns ,Column 1 has all the users on it and column 2 is for the moderators.If an admin selects one of the user then clicks on add then user must be in the column 2

I am adding a real time example (Screenshot) attachment

http://www.flickr.com/photos/[email protected]


Any tutorial on it please? Thank you