I knwo why some parts of my menu are highlighted !!!
That's just because I made a general menu and copy / paste it into several pages, so the page where I am has a link for herself in the menu... So when scrolling the menu, the item that refers to this page (already loaded) is highlighted, just to say "you're here" ...
I understood that because I saw several pages with this menu, and each time, it wasn't the same item highlighted.
Thank you again for your help, have a good day !
PS : i can give you my website url :
http://anat.rouen.free.fr
Don't visit it before 6 or 7 hours after this post, otherwise you would see the ancient version.
I can't give you an hour for the update just because I'm french and it is now 15 h 10, and i dunno what time it is in your countries...

So for France, i Would say "19h"...:p
have a good day !