SQL & PL/SQL :: Updating Accounts And Displaying Changes?

I'm trying to write procedures to make updating account owners and the like easier for a group of DBA's.

What I want to do, is create a procedure that displays the changes live.

e.g. If I changed the owner of 5 users from owner 100 to owner 200 it will display:

User test1 owner changed from 100 to 200
User test2 owner changed from 100 to 200
User test3 owner changed from 100 to 200
User test4 owner changed from 100 to 200
User test5 owner changed from 100 to 200

I can not get a loop to work to save my life. Here's what I have to update the account so far...

PROCEDURE UPDATE_OWNER (OWNER NUMBER, NEW_OWNER NUMBER) IS
BEGIN

UPDATE ACCOUNT_TRACKING
SET ACCOUNT_OWNER=NEW_OWNER WHERE ACCOUNT_OWNER = OWNER
AND ACCOUNT_TYPE !='P';
DBMS_OUTPUT.PUT_LINE ('Account Owner '||OWNER||' Changed to '||NEW_OWNER);
END UPDATE_OWNER;