var http_request_aj = false;
   var _id_reco = "-1";
   function makePOSTRequest_aj(url, parameters) {
      http_request_aj = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request_aj = new XMLHttpRequest();
 /*
         if (http_request_aj.overrideMimeType) {
            http_request_aj.overrideMimeType('text/html');
            }
*/            
         
      } else if (window.ActiveXObject) { // IE
         try {
            http_request_aj = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request_aj = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request_aj) {
         alert('Cannot create XMLHTTP instance');
         return false;
      }
      
      http_request_aj.onreadystatechange = alertContents_aj;
      http_request_aj.open('GET', url, true);
      http_request_aj.send();
   }

  function alertContents_aj() {
      if (http_request_aj.readyState == 4) {
         if (http_request_aj.status == 200) {

            	document.getElementById('myspan'+_id_reco).innerHTML = '<font color="red">Merci, nous allons prendre en compte votre contribution</font>';
         } else {
            alert('There was a problem with the request.');
         }
      }
   }
   
   function get_aj(id_reco,usr) {
   	  _id_reco = id_reco;
      makePOSTRequest_aj('/aj_recos.php?id_reco='+id_reco+'&id_user='+usr,null);
   }