little sql help

Hi, I need a little help with an update statement. I have 2 tables linked by id and want to update table A with some data in table A. I want to set table B's last and first name from table A's. Ideas?

A:

    id
    last_name
    fist_name

B:

    id
    last_name
    fist_name Received on Mon Dec 25 2000 - 06:51:57 CST