The software uses a customizable template to produce the gallery. The whole template must be kept simple and there isn't any design that really needs to be done.
So the thumbnails are displayed at the top and whichever one is seleceted is displayed below in full size with the image title diplayed ontop and below the selected image.
A .zip file is attached to show you what exactly is being done. Open up the index file with your browser and you will see the current gallery. Everything works fine except the image title does not change when the image changes. The template is also provided in the .zip file.
I can't figure it out but I am sure it will be easy money for anyone who knows this type of stuff.