Random Images with Refresh Button? Help please!

[CreatorCaz]

I need a bit of help here please! If anyone can help me out I'll be really grateful! ^_^

I'd like to have a page that displays a random image, then underneath the image, there's a button that say refresh, but I'd like it so it JUST refreshes the image, not the whole page. It's for my webcam, to show random stills, to make it appear kinda live, but it's not.

Can anyone help? Thankies. ^_^