it's gotta be easy, you can probably change the way it retrieves images, instead it can retrieve and display text.
Instead of taking <img> it can do php include <name of the article.php> something like that.
All those articles could be stored in db instead of images, but, to be honest, I think you should look for a different script for that. I think any forum software that allows ratings would be your best bet. You just have to modify the template and take out the unnecessary parts.
Good luck