function lire_plus () {
	//$('lire_plus').hide();
	if ($('topo').style.display=='none') {
		new Effect.BlindDown('topo', { duration: 0.6 });
		$('lire_plus').update('raccourcir');
	} else {
		new Effect.BlindUp('topo', { duration: 0.6 });
		$('lire_plus').update('lire plus');
	}

	//alert($('topo').getHeight())
	//$('topo').getHeight();
}