display random images from each album

Hello friends, please check this site: http://photos.jssonline.org/ This site includes 3 parts to display images.
1) Image gallery (here it has 8 albums. So it displays the 8 images)
2) Random files (one image each from the album, so that if i click any one image it will link to that album.
3) All images (It displays all the images.).
Which module i have to use? If anyone knows please inform me. Thanks in advance.

I have posted this query in drupal forum: http://drupal.org/node/1003100