Hi Rob
Thanks for your response. I use the theme Ashima which ave a footer.php :-)
I have added the line you write before in this file and............all is fine for the plugin "Collapse Archive 1.0.3".
But not for the plugin "Collapse Categorie version 1.0 and after" :-(( : I have already a problem...but not the same as before.
Now, I can expand the categories but one of my categorie (the most important for me : the "Albums photos") is no more visible on my blog !!!!
If I go back withe the version 0.6.4, it work again : strange, realy, no ?
Maybe another problem : in the Setting section of WP, when I choose Collapse Archive or Categorie, I've got a blank page with this text : Are you sure to want this (y/n) and nothing else : is it normal ?
regards,
Damien