function initialize() { 
var myLatlng = new google.maps.LatLng(37.120607, 126.831469); // y, x좌표값
var mapOptions = { 
      zoom: 15, 
      center: myLatlng, 
      mapTypeId: google.maps.MapTypeId.ROADMAP 
} 

var map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions);
var marker = new google.maps.Marker({ 
          position: myLatlng, 
          map: map, 
          title: "회사이름" 
}); 
var infowindow = new google.maps.InfoWindow( 
        { 
          content: "<h1>회사이름</h1>", 
          maxWidth: 300 
        } 
); 

google.maps.event.addListener(marker, 'click', function() { 
infowindow.open(map, marker); 
}); 
}