Each folder represents a gallery. 

If you are using php, the titles of the folders and images are used,
you can Use underscores ( _ ) to include a space e.g China_landscape will display as China landscape. Please
read the php folder help file to find out how to setup the folders for php use.

Prefix your filenames (images not folders) with mainThumb_ to put them as the image shown in the menu. e.g sunny.jpg 
becomes mainThumb_sunny.jpg

These image can not be used in any commerical projects, they are provided only to show the functions fo the file.