That is what is known on this forum as a: K3
It our index system, you will find a K3 index page:
https://wiki.mobileread.com/wiki/K3_Index
Which will in turn lead you to the commonly used screensave hacks for the K3.
Reading that install script for the hack(s) will tell you where on the file system to look for changes.
OR
Wait and hope that one of the screensaver hack authors notices this thread and tells you where/what to look for.
I personally don't know just off hand, I would have to do the same as I suggest that you do above - look it up or wait.