var activeMapID;

function showMapInfo(id) {

  if (id == activeMapID)
    return;

  info = document.getElementById("mapInfo" + id);
  info.style.display = "inline";

  if (activeMapID) {
    info = document.getElementById("mapInfo" + activeMapID);
    info.style.display = "none";
  }

  activeMapID = id;
}