Rotating Pool of Images?

[JBc3]

Hi all - not sure if this has been covered - or at least specifically for what I'm asking. I searched and found a number of links, but in reading them none seemed to be exactly what I'm after.

If anything is please link or point me to it.

Basically - I want to have a pool of vendor images that are all available to see in my sidebar - but are changed up in their ordering each time a page is loaded or refreshed. An exact example is right here :: www.pro-touring.com -- simply hit refresh a couple times and you'll see the images are all there, just randomized in order.

Any thoughts?
Thanks a lot!