function popupImage(img) {
titre="Agrandissement";
var top = (screen.height-400)/2;
var left = (screen.width-400)/2;
w = open('','image','top='+top+',left='+left+',width=400,height=400,toolbar=no,scrollbars=no,resizable=yes');
w.document.write(''+titre+'');
w.document.write('