Changing Salvage Value to Zero

SOLVED

I recently took over the Fixed Assets at our company.  I notice that some assets were put in the Fixed Asset program with a Salvage Value for the Internal book.  Some of the assets are still being depreciating and some of them reached the end of their Estimated Life on 12/31/12, so depreciation ended then.  We have determined that they should not have been put in with a Salvage Value, so I would like to change that field to zero, and depreciate the rest of the value of the assets.  What is the best method to do that? 

I have tried to make the change in a test company on an asset that was "fully depreciated" on 12/31/12.  When the box popped up for the Critical Depr Change, I tried making the change both as the Period Close Date (which is 12/2012) and also using the Current Thru Date.  I depreciated the assets for the end of Oct as a test, but no change to the depreciation calculations for 2013.  The Net Book Value still lists the amount of the previous Salvage Value.  Any advise?