Image slideshow plugin?

I have a photoblog of pictures of my dog here: https://helothevizsla.com

I want to post images with a 500 px long edge, but I’d like viewers to be able to click on the images to see a slideshow with much larger images.

I discovered the Cooliris plugin, which seems to be a good choice. However, the problem is that if I post images with 500 px long edge (which is how I want them to appear on the blog), the resolution isn’t high enough for the Cooliris slideshow.

Is there another slideshow plugin that would allow me to post full-size images that appear as 500 px thumbnails in the body of the post?

Thanks.