function popup(mylink, windowname) {
   if (! window.focus) { return true; }

   var href;

   if (typeof(mylink) == 'string')
      href=mylink;
   else
      href=mylink.href;
      window.open(href, windowname, 'width=640,height=480,scrollbars=yes,resizable=no,location=false,status=no');
      return false;
   }