function toggleReponse(el)
{
	var show = false;
	if ( Element.getStyle( el.id + '_rep', 'display') == 'none' ) show = true;

	var list = $$('.reponse', '.reponse2');
	for ( var i = 0; i < list.length; i++ ) Element.hide( list [i] );

	if ( show ) Element.setStyle( el.id + '_rep', { display: 'block' } );
}