function fenetre(adresse) {demonstration = window.open(adresse, '', 'location=no,toolbar=no,directories=no,menubar=no,resizable=no,scrollbars=no,status=no,width=590, height=800');}
function fenetre(adresse) {demonstration2 = window.open(adresse, '', 'location=no,toolbar=no,directories=no,menubar=no,resizable=no,scrollbars=yes,status=no,width=650, height=800');}
function fenetre(adresse) {demonstration3 = window.open(adresse, '', 'location=no,toolbar=no,directories=no,menubar=no,resizable=no,scrollbars=yes,status=no,width=400, height=650');}
function fenetre(adresse) {demonstration4 = window.open(adresse, '', 'location=no,toolbar=no,directories=no,menubar=no,resizable=no,scrollbars=yes,status=no,width=700, height=700');}
function fermer() {window.demonstration.close();}