Image path with custom PHP script

Had a simple php script written for me by a developer to randomly change out series of given images upon reload of the page. Worked great on both index and template pages of previous site, but now is having issues with new version of WP. Script seems to work in randomly grabbing images 1-3, but shows broken link on live page?

Link to working beta site (bottom left image of featured belt):
https://voodoobean.com/wpbeta/

Link to broken beta site:
https://voodoobean.com/wpalpha/parish/

[Code moderated as per the Forum Rules. Please use the pastebin]

Error:
GET https://voodoobean.com/wpalpha/parish/registration/images/pageimage1.png 404 (Not Found)

Thanks much for any and all help!
Randy