function lanzar(ventana_w, ventana_h,imagen,leyenda) {
	ventana_h = ventana_h;
  var remote = open('foto.htm?' + imagen + '&' + leyenda,"frm_foto", "left=50,top=50,width=" + ventana_w + ",height=" + ventana_h + ",resizable=no,scrollable=yes,scrollbars=no,menubar=no,status=no,toolbar=no,location=no,directories=no");
  if (navigator.appName == "Netscape") remote.focus ();
}