I found the thread where I got the Random Code from:

https://www.ubbcentral.com/forums/ubbthreads.php/topics/260118/random-image-island

I updated mine to the last code modification there (Thanks isaac !!) and it works with a larger pic.

Can a code like that be modified to pick and Display a Random Thread within a specific Forum?

ECN Electrical Forum: https://www.electrical-contractor.net/forums/
My Day Job: https://www.licensedelectrician.com/