function Ajax() {
  try {
    return new ActiveXObject("Microsoft.XMLHTTP");
  } catch(e) {
    try {
      return new ActiveXObject("Msxml2.XMLHTTP");
    } catch(ex) {
      try {
        return new XMLHttpRequest();
      } catch(exc) {
        return false;
      }
    }
  }
}




function openfoto(){
window.open("mapa.php", "JANELA", "height = 500, width = 500,top=50,left=50");
}