Floating/drifting objects

Hello all,

I am trying to create a screen that involves circular images that are simply drifting around slowly in space, confined within a circular area. There would be simple collision detection to the extent that the images do not overlap eachother.  This could be a loopable video, or a coded environment that allows them to drift around forever. I am just looking for the most straightforward way of accomplishing this.

I may choose to incorporate physics, in that the images can be pushed with the mouse to bounce off of other images, but this is a secondary goal; I primarily just want to create the environment that allows the images to float around.

I am hopeful that there is a template somewhere on the Net that will allow me to swap in my own images or objects for the default objects in the template. I have seen this done before with Flash pulling from an XML file of objects with images associated with them. However, I do not know the code I would need to use to allow the images to float around randomly. I would rather not code the keyframe animations for this, since it seems quite tedious (unless there's an easier way to do it than a bunch of tweens).

Any help is appreciated. Thank you!

Taylor