About picture thumbnails

Hello,

I installed Gallery2 on my site yesterday and I am having problem displying the thumbnails leading to the images. A perfect example can be found on http://pictures.thelineberrys.com/gallery2/gallery2.php.

The URL of my site is http://www.starradio.org.lr/gallery2/main.php. There is one thumbnail for all of the images and I would like to display the thumbnail of each of the images.

I would appreciate any help from someone.

Thanks