function aff_img(url){

offw=200;
offh=100;

w=screen.availWidth-(offw*2);
h=screen.availHeight-(offh*2);

window.open("affiche_image.php?url="+url+"&w="+w,"POI Pantin - Trait libre","location=no,menubar=no,status=no,directories=no,toolbar=no,resizable=yes,scrollbars=yes,top="+offh+",height="+h+",left="+offw+",width="+w);

}