function freepbx_dialer(phone_to_dial, user_ext)
{
  //var answer = window.confirm('Ready to call phone number? ' + phone_to_dial + '\n\nFrom your extension: ' + user_ext + '\n\nRemember you must "answer" your phone to start the call');
  //if (!answer) {return;}
  
  var xmlhttp = new XMLHttpRequest();
  var params = {'data[call_phone]': phone_to_dial};
  var url = 'freepbx_ajax_dialer.php?' + get_url_params_freepbx(params);
  xmlhttp.open('GET', url, false);
  xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200) 
    {
      var response = xmlhttp.responseText;
      //alert(response);
    }
  }
  xmlhttp.send(null);
}

//used elsewhere for NoteWriter -- custom name here to avoid conflict
function get_url_params_freepbx(data){
  return Object.keys(data).map(function(key) {
    return [key, data[key]].map(encodeURIComponent).join("=");
  }).join("&");
}