function popup(nom,width, height, left, top) {
     // The viewer resizes itself automaticalle
     day = new Date();
     id = day.getTime();
     eval("page"+id+" = window.open('"+nom+"' , '"+ id +"', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width="+width+",height="+height+",left="+left+",top="+top+"');");
}