Edit data, but only updated after approve by manager

Hi, how to do this,
Employee could update his data, but it is pending wait for boss approval. After boss approves, that the data is updated.
Could someone give me basic logic or idea ? 
Thanks everyone (please forgive my english)

1) Create an Employee temp table and store the same information in that table.
2) When approved move the data in the Employee temp table to the Employees table.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

create a column flg_status, for approved or not

He still needs a temp table or he will over write the Employees data.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )