function ajax_loading_start(idElement) {

  var el = $(idElement);
  if(el!=null) {                                    
  
    el.innerHTML = '<img src="'+URL+'images/loading.gif" />';
    el.style.display = 'inline';
  
  }

}

function ajax_loading_stop(idElement) {

  var el = $(idElement);
  if(el!=null) {
  
    el.innerHTML = '';
    el.style.display = 'none';
  
  }

}