MyBB Community Forums

I'd be extremely grateful if you could help me with this. I've made some modifications to the appearance of a theme called The Cure by Audentio Design. If you go to my forums (currently down for maintenance, but you can see the theme) you will notice that you can right-click and view the header logo image, which is called "logo.jpg".

I want to make it so there are several instances of logo.jpg, and it will load a random one when a user visits. I know there are some themes that do this for you, but I want to know how to do this for this particular theme.

Thanks, and all the best,
Mantis