function getHttpText(httpRequests){
  var responseText="";

  for(i = 0 ; i < httpRequests.length ; i++){
    if(httpRequests[i]!=null){
      var req=httpRequests[i];
      if(req.readyState==4){
        if(req.status==200){
          httpRequests[i]=null;
          responseText=req.responseText;
        }
        else{
          httpRequests[i]=null;
        }
      }
    }
  }

  return responseText();
}

PS : ne cherchez pas à comprendre…