function show (photo_id_prefix, index) {
	var photo_id = photo_id_prefix + '_' + index;
	var photo_to_show = document.getElementById(photo_id);
	if (photo_to_show)
	{
		photo_to_show.style.display = 'block';
	}
	// on rend actif la cellule qui a chargé cette photo
	var cell = document.getElementById('td_' + photo_id);
	cell.className='active';
	// on lui supprime l'événement onMouseOut
	cell.removeAttribute('onMouseOut');
	// on cache les autres
	var i = 1;
	var photo_id = photo_id_prefix + '_' + i;					
	var photo_to_hide = document.getElementById(photo_id);
	while (photo_to_hide)
	{
		if (i != index)
		{
			// la photo
			photo_to_hide.style.display = 'none';
			// la cellule
			cell = document.getElementById('td_' + photo_id);
			if (cell)
			{
				cell.className='';
				// on rajoute l'événement onMouseOut
				cell.setAttribute('onMouseOut', "this.className = '';");
			}
		}
		i++;
		photo_id = photo_id_prefix + '_' + i;
		photo_to_hide = document.getElementById(photo_id);
	}
}

function show_install (install) {
	var install_id = document.getElementById('_install');
	if (install_id)
	{
		install_id.value = install;
		document.forms[0].submit();
	}
}