Simply add thumbnails?

Hi,

I use the slideshow a lot. But now I have a design where I want to use thumbnails in stead of the bullets. Is there a simple way to add these thumbnail by adding a code to the php files?

Tried other slideshows, but don’t work that well and aren’t that user friendly as this one. So I realy want to stick with this one.

Thanks!

https://wordpress.org/plugins/slideshow-jquery-image-gallery/