function chEtat(id_image, etat)
{
	var etat_image = (etat == true) ? 'v' : 'r';
	var nom_image = '';

	switch(id_image)
	{
		case 'accueil':
		case 'chateau':
		case 'parc':
		case 'manif':
		case 'autour':
		case 'info':
		case 'lien':
			nom_image = 'm_' + id_image + '_' + etat_image;
			break;
		default:
			nom_image = 'm_accueil_' + etat_image;
			break;
		
	}

	document.getElementById(id_image).src = 'images/' + nom_image + '.jpg';
}