// -----------------------------------------------------------------------------		
function maj_extra_semaines(str_nb_semaines) 
{

	var nb_semaines = parseInt(str_nb_semaines);

	if (nb_semaines > 1) 
	{ 
		nb_extra_semaines = nb_semaines - 1;
		str = '(dont <b>'+nb_extra_semaines + '</b> extra semaine';
		if (nb_extra_semaines > 1) str += 's';
		str += ')';
		display = 'block';
	} else
	{
		str = '';
		display = 'none';
	}
	var obj = document.getElementById('info_extra_semaines');
	obj.innerHTML = str;
	obj.style.display = display;
	return true;
}