Gena supports the "rollover" effect for thumbnails. We call it rollover
Rollover is an image that changes when the mouse pointer moves across it. When the user points to one of the thumbnails an Internet browser displays another version of the same thumbnail. The Thumbnails window allows you to create rollover by adding special effects to a thumbnail picture (e.g. modifies brightness, color or border color).
Here is an example of rollover thumbnails. Move the mouse pointer to any thumbnail below and see for yourself:
In this example we used two effects: a different border color and a monochrome image.
There are two drawbacks of rollover thumbnails: user's browser should support
the "gallery weight" (total size of gallery files). However, we don't
and it's usually enabled (you've probably seen a lot of pop up adds lately,
files usually take up a very small amount of the disk space anyway compared
to full-size images, so a typical gallery size increase will be less than 5%.
We think you can afford it.