Well I'm sure everyone's seen this at one time or another. It's when someone has an image displaying on a page, and every time you refresh it, a different picture appears. Now, I'm talking about the actual image changing, but the name remaining the same.

For example, you load the page, and the image shows up. The image's location is "http://www.whatever.com/image.jpg". Now, you refresh the page, and the image is different, but it's still located at "http://www.whatever.com/image.jpg".

So hopefully that makes sense... and I'm wondering how would I do this? Does anyone know of a tutorial anywhere? I tried google, but didn't find what I was looking for.

If you need more clarification, just reply and I'll try to explain as best I can.