CheckboxImageFile s;

s: string

default value of s: default.gif;

Sets the image file used to represent the checkboxes.
The passed parameter must be the name of a file located in images/check.
The file is a 30x15 GIF or JPEG, made up from two equal parts. The first represents the unchecked box. It's a good idea to use a transparent GIF.

Sample : Night, Tatooine