[Plug-in NextGEN Gallery] slideshow : how to display image description

Hi Alex,
Thanks for the plugin.
Do you know how to modify the imagerotator.swf so that the images descriptions stay on the pictures.
Check this (second slideshow at the bottom of the page)
https://therapidpage.free.fr/dossiers/image_rotator/image_rotator.html

I want to do the same, I suppose I must change a variable.
Do you know how to open imagerotator.swf and what variable I must look after.
Thanks for any help or lead.
Cheers
Guillaume