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I found a solution, there was a conflict between the module script of the menu and the script of the top menu (the one with the login).
I have downloaded the new version of mygosumenu (the one used to do the top menu) and i modified the old menu block of the content module with a new one made from my own. I have also modified the top menu to fit the new version of mygosumenu.
Thanks to everybody
scO_Oby