우선 불러오고..

function googleMap(latitude,longitude)
{
 
 var myLatlngc = new google.maps.LatLng(latitude,longitude);
 var myLatlng = new google.maps.LatLng(latitude,longitude);
 var myOptions = {
   zoom: 17,
   center: myLatlngc,
   mapTypeId: google.maps.MapTypeId.ROADMAP    }
 
 var map = new google.maps.Map(document.getElementById("map"), myOptions);
 
 var contentString = '여기는어디?';
  
 var infowindow = new google.maps.InfoWindow({
  content: contentString
 });
 
 var marker = new google.maps.Marker({
  position: myLatlng,
  map: map,
 });
 google.maps.event.addListener(marker, 'click', function() {
   infowindow.open(map,marker);
 });
  infowindow.open(map,marker);
 
}

window.onload = function() {
 
 googleMap(좌표1,좌표2);

};