rewrote the function to select annotations to make them clearer.
No more functional magic!
function boutonHautDePage(){
$("#top-page").click(function() {
var hauteur = 0;
$('html,body').animate({scrollTop: hauteur}, 1000);
});
return false;
}
//
Drupal.behaviors.franceculture_header_footer = function (){
boutonHautDePage();
}