function getId(id)
{
  var item = null;
  if (document.getElementById) item = document.getElementById(id);
  else if (document.all) item = document.all[id];
  else if (document.layers) item = document.layers[id];
  return item;
}

function strona(id, link) {
  advAJAX.get({
              url : link,
              onSuccess : function(obj) { document.getElementById(id).innerHTML = obj.responseText; }
            });
}