function initMap() {
     var uluru = {lat: 35.6866980, lng: 127.9095380};
     var uluru2 = {lat: 37.5662950, lng: 126.9779450};
     var uluru3 = {lat: 35.6866980, lng: 127.9095380};
     var uluru4 = {lat: 37.5662950, lng: 126.9779450};

     var map = new google.maps.Map(document.getElementById('map'), {
       zoom: 18,
       center: uluru
     });
     var marker = new google.maps.Marker({
       position: uluru,
       map: map
     });
      
      
     var map2 = new google.maps.Map(document.getElementById('map2'), {
         zoom: 18,
         center: uluru2
       });
     var marker2 = new google.maps.Marker({
         position: uluru2,
         map: map2
       });


     var map3 = new google.maps.Map(document.getElementById('map3'), {
         zoom: 18,
         center: uluru3
       });
     var marker2 = new google.maps.Marker({
         position: uluru3,
         map: map3
       });

     var map4 = new google.maps.Map(document.getElementById('map4'), {
         zoom: 18,
         center: uluru4
       });
     var marker4 = new google.maps.Marker({
         position: uluru4,
         map: map4
       });
      
     google.maps.event.addDomListener(window, "load", initMap);
   }