This simple contribution does three things.
A drop down is added to the product edit page of sub-folders of the images folder to allow you to select where the product image is to be stored.
A field is added to allow you to create a new sub-folder of images to store your images in.
A function is added in the product edit page to give a instant update option.Some folders within the images directory can be excluded from the drop down list through an exclude list.
Only one file to edit (categories.php) and only five edits to that!!
Tested on PHP 4 & 5, SQL 4 & 5, osC 2.2 ms2, rc1 & rc2a and is register_globals off compatible.
Support thread at http://forums.oscommerce.com/index.php?showtopic=347582