Thank you

.
Everything is working now but I've found (I think) a small bug...
1- My first mistake was that I tried to show the map in a "Category Layout" instead of a "Category List Layout"...
2- In the description of one category, the geotagging title was "Pic de l'Ours" and it seems that I cannot write a geotagging title with a quote character. With "Pic de l'Ours" the map doesn't appear, with "Pic de lOurs" it's ok.
I've found this problem thanks to the Error Console of Firefox which tells:
Erreur : missing ) after argument list
Fichier Source : http://www.*mywebsite*.com/index.php?option=com_phocagallery&view=categories&Itemid=21
Ligne : 179, Colonne : 11
Code Source :
">Pic de l'Ours</a></b></td></tr....
It doesn't matter for me, I can avoid the quote character.
Bye.