function displaycrit(id)
{
	var bloc = document.getElementById(id);
	var bouton = document.getElementById('btn_crit');

	if(bloc.style.visibility == 'visible')
	{
		bloc.style.visibility='hidden';
		bouton.src = 'images/plus-criteres.png';
	}
	else
	{
		bloc.style.visibility='visible';
		bouton.src = 'images/masquer-criteres.png';
	}
}