[Google Maps API v3] Object Created but not Consumed?

[A. Shore]

Folks, in the snippet below, object marker_obj is created but with no
further reference that I see.

But beachMarker  icon doesn't display  unless marker_obj is indeed
defined.

Can someone explain the (apparently) invisible reference?


        function init() {                                                       
        // Called on the intiial page load.
                var map_obj = new
google.maps.Map(document.getElementById('map_canvas'), {
                        zoom: 14,
                        center: new google.maps.LatLng(37.44, -122.14),
                        mapTypeId: google.maps.MapTypeId.ROADMAP
                        });

                var marker_obj = new google.maps.Marker({
                        position: new google.maps.LatLng(37.43, -122.13),
                        map: map_obj
                        });

                var image_file = 
'http://code.google.com/apis/maps/documentation/v3/
examples/images/beachflag.png';
                var beachMarker = new google.maps.Marker({
                        position: new google.maps.LatLng(37.45, -122.15),
                        map: map_obj,
                        icon: image_file
                        });
                }                               // end function init()

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