function ouvre1() {
fenetre51=window.open ("im/vr/venus.html","Venus"
,"toolbar=no,location=no,directories=no,status=no,scrollbars=no,resizable=no,copyhistory=no,width=200,height=220");
};

function ouvre2() {
fenetre52=window.open ("im/vr/bronze.html","Bronze"
,"toolbar=no,location=no,directories=no,status=no,scrollbars=no,resizable=no,copyhistory=no,width=200,height=340");
};