/*----------------------------------------------------------------------*/
/*                                                                      */
/*----------------------------------------------------------------------*/
function objetoAjax() {
  var xmlhttp = false;

  try {
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
  }
  catch (e) {
    try {
      xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch (e) {
      xmlhttp = false;
    }
  }

  if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
    xmlhttp = new XMLHttpRequest();
  }

  return xmlhttp;
}