d.onCleanup is not a function

[VaN]

I'm working in this site for a client : http://www.cymbeline.com/fr_FR/index.php5

i'm trying to load a fancybox on a link to display a newsletter
subscription form. At the moment, the link is hidden, under the left
menu. I've set a grey font so it's not visible. When I click on it,
Firebug return a "d.onCleanup if not a function".

I've read this error happens when CSS is not loaded, or something
about others css files previously loaded with title attributes. But I
load my fancybox CSS before every othr CSS. CSS is loaded, JS files
are loaded, everything should work fine, but it's not. When I click
the link, the form appears, but without any fancybox CSS.

Any help would be appreciated.

[JFK]

I don't see that you are using fancybox in that page