the way i would do it in wordpress.
1. make a theme from scratch have a div for each post (going across the screen, maybe 10-11 thumbs?)
2. use the uploader in the post area to upload the image to be rated
3. in your single.php get the attachment that was uploaded
4. use a rating plugin (lesterchans is the best)
basically in a nut shell.
could also list rows of most popular , and random on the index.
also found this.
http://www.scripteen.com/scripts/scr...ng-script.html
might be what you are looking for.