Looking for a specific rotating image script

Hey all,

I'm looking for a script that would rotate banners/images on a random basis each time you loaded the page. But here's the trick: I want the script to randomize any images in a certain directory -- in other words, i don't want to have to code each image into the script.

Does that make sense?

My goal is to have a procedure automatically dump new images into a directory each day and the script to rotate them. But since the images may vary in number, i can't specify in the script how many or their names.

If there is a script that does what i want, or a different way to do it, i'd really appreciate guidance.

Thanks.