Detect changed fileds in form

Hi all,
I want to build a "history" function in my Apex appliaction.
My idea is to record all changes in a existing record, in a new table, but I'm having some trouble to find the best way to do this.
I figured it out this way: After the user edit the record and submit the form, ONLY the changed fields will be recorded to the new history table. The fields that had no changes, will be ignored.
My problem is: how to identify the changed fields? Maybe create a function that will compare all fields, one-by-one, with the existing one and detect the changed one, but doesn't look like a very efficient way.
Does anyone have a better solution? Anyone already did something like that?
Thanks!

Using a trigger, that will loop through and determine what columns have changed (comparing :old. and :new.). How are you going to do this? One row per changed item is how I normally have seen it (Old Value: XX) in one column and (New Value in another)..
Thank you,
Tony Miller
Webster, TX
Never Surrender Dreams!
JMS
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Hello,
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Thanks a lot for replying, your example is being of help but
i think you misunderstood my post and i still have some doubts.
More than one item can be a winner, not just one, so i will
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On my fill method i have something like this:
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of bids and each has its winner property to true or false. Then i
insert a new item and the fill method is executed again (due to
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I have checkWinners() function which is the one i call inside
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Detect changed fileds in form

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