Classic players are real COOL!! But I `d like to replace all those CFs with real photo portraits, like those attached

!
When I use the Mod Tool - Texture and 3D Importing/Exporting, and
try to import & replace the player portrait , what kind of file format should I prepare beforehand, like JPEG or sth?? Do any bro knows if there is any tutorial on this in details.
Also, is the Mod Tool - Texture and 3D Importing/Exporting (download link:
http://download.nba-live.com/index.php?act=view&id=2516)the best & simpliest way to do this task?
Thx
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