var ajax;
  
  function initAjax() {
    if (window.XMLHttpRequest) {
      ajax = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
      ajax = new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
  
  function sendMapType(mt) {

    if (!ajax) {
      initAjax();
    }
    if (ajax) {
      if ((ajax.readyState == 0) || (ajax.readyState == 4)) {
        ajax.open("GET","/ajax_receive_gmap_type.php?gmap_name=" + mt.getName(), true);
        ajax.send(null);
      }
    }
  }

  function getMapTypeFromName(name) {
  
    s = name.substr(0,3).toLowerCase();
  
    if (s == "kar") {
      return G_NORMAL_MAP;
    } else if (s == "sat") {
      return G_SATELLITE_MAP;    
    } else if (s == "hyb") {
      return G_HYBRID_MAP;        
    }

  }