Zoom Control Missing (+) and (-) Image

Question

I am having problems with the zoom control for google maps. The (+) and (-) image is not showing, only an invisible link.

I think it might be the javascript code. I am attaching a picture and code snippet. Suggestions are very welcome =)

Screen Shot Map:

See Image Link

Code snippet:

    ...
    function initialize()
    {
        "use strict";
        geocoder = new google.maps.Geocoder();

        var listing_lat = jQuery('#property_latitude').val();
        var listing_lon = jQuery('#property_longitude').val();

        if (listing_lat==='') {
            listing_lat=google_map_submit_vars.general_latitude
        }

        if (listing_lon === '') {
            listing_lon = google_map_submit_vars.general_longitude
        }

        console.log(listing_lat + ' / ' + listing_lon);

        var mapOptions = {
            zoom: 17,
            scrollwheel: true,
            disableDefaultUI:false,
            center: new google.maps.LatLng(listing_lat, listing_lon),
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        map = new google.maps.Map(
            document.getElementById('googleMapsubmit'),
            mapOptions
        );
        google.maps.visualRefresh = true;

        var point=new google.maps.LatLng(listing_lat, listing_lon);
        placeSavedMarker(point);

        google.maps.event.addListener(map, 'click', function(event) {
            placeMarker(event.latLng);
        });
    }
    ...