function showLayer(nom_layer)
{document.getElementById(nom_layer).style.visibility = "visible";
if (nom_layer != 'l_artiste') document.getElementById('l_artiste').style.visibility = "hidden";
if (nom_layer != 'la_soie') document.getElementById('la_soie').style.visibility = "hidden";
if (nom_layer != 'catalogue') document.getElementById('catalogue').style.visibility = "hidden";}

function showLayer2(nom_layer)
{document.getElementById(nom_layer).style.visibility = "visible";}

function hideLayer2(nom_layer)
{document.getElementById(nom_layer).style.visibility = "hidden";}