Thank you for the update. I suspect even
Calico Pie may be unaware of that.
So please report it to them via the how_to:about#problem_reporting|> Problem Reporting ticket system.
The web site you mention only offers
Lytebox v3.2, whereas
FH uses
v4.0, and
v5.5 was available.
As Jane suggests you may be able to use search & replace on all the generated web pages.
She refers to my plugins:help:improve_html:improve_html|> Improve Website or CD DVD HTML Plugin that already offers some alternatives in its plugins:help:improve_html:imagepopup|> Improve Website or CD DVD HTML ~ Media Popups Tab.
You could look at how that
Plugin handles the conversion from one to another.
If I find the time I might look at incorporating
http://www.highslide.com as another alternative.