I need to apply one CSS CLASS to each tab instead 1 for all. I think that I have to modify "helpers/proyect_website.php adding a CSS in:

add_tabbed_navigation_item(new TabbedNavigationItem(
  PROJECT_TAB_OVERVIEW, 
  lang('overview'), 
  get_url('project')
));

But i dont know how. Maybe inserting an image directly?

Thanks,