(Apologies to the list if this has been already answered, I just received this email from the list yesterday).
John,
The files you are looking to modify are in a jar file in the modules directory. For our current version the file is called
mod-purl-documentation-1.6.3.jar
You have to unpack the jar file, change the files, repack and replace the existing version, then restart PURL to see the changes.
Here's the snippet from our docs, starting at the PURL top directory (replace x with your current version:
cd modules
mkdir temp
cp mod-purl-documentation-1.x.jar temp
cd temp
jar xvf mod-purl-documentation-1.x.jar
(make changes in sub directory resources, return to temp)
(rm old jar file)
jar cvf mod-purl-documentation-1.x.jar *
cd ..
cp temp/mod-purl-documentation-1.x.jar . (you probably want to back up the current file first)
(restart purl to see changes)
Hope this helps! IIRC image files will be in the unpacked jar file under resources/images.
Gary Phillips
Florida Center for Library Automation