function GroundOverlay(bounds, image, map) {

    // Now initialize all properties.
    this.bounds_ = bounds;
    this.image_ = image;
    this.map_ = map;

    // We define a property to hold the image's
    // div. We'll actually create this div
    // upon receipt of the add() method so we'll
    // leave it null for now.
    this.div_ = null;

    // Explicitly call setMap() on this overlay
    this.setMap(map);
}

GroundOverlay.prototype = new google.maps.OverlayView();

GroundOverlay.prototype.onAdd = function () {

    // Note: an overlay's receipt of onAdd() indicates that
    // the map's panes are now available for attaching
    // the overlay to the map via the DOM.

    // Create the DIV and set some basic attributes.
    var div = document.createElement('DIV');
    div.style.border = "none";
    div.style.borderWidth = "0px";
    div.style.position = "absolute";

    // Create an IMG element and attach it to the DIV.
    var img = document.createElement("img");
    img.src = this.image_;
    img.style.width = "100%";
    img.style.height = "100%";
    div.appendChild(img);

    // Set the overlay's div_ property to this DIV
    this.div_ = div;

    // We add an overlay to a map via one of the map's panes.
    // We'll add this overlay to the overlayImage pane.
    var panes = this.getPanes();
    panes.overlayLayer.appendChild(div);
}

GroundOverlay.prototype.draw = function () {

    // Size and position the overlay. We use a southwest and northeast
    // position of the overlay to peg it to the correct position and size.
    // We need to retrieve the projection from this overlay to do this.
    var overlayProjection = this.getProjection();

    // Retrieve the southwest and northeast coordinates of this overlay
    // in latlngs and convert them to pixels coordinates.
    // We'll use these coordinates to resize the DIV.
    var swBounds = this.bounds_.getSouthWest();
    var neBounds = this.bounds_.getNorthEast();
    var sw = overlayProjection.fromLatLngToDivPixel(swBounds);
    var ne = overlayProjection.fromLatLngToDivPixel(neBounds);

    // Resize the image's DIV to fit the indicated dimensions.
    var div = this.div_;
    div.style.left = sw.x + 'px';
    div.style.top = ne.y + 'px';
    var w = parseInt(ne.x - sw.x);
    if (w < 0) {
        w = 0;
    }
    div.style.width = w + 'px';
    div.style.height = (sw.y - ne.y) + 'px';
}

GroundOverlay.prototype.onRemove = function () {
    this.div_.parentNode.removeChild(this.div_);
    this.div_ = null;
}

// Note that the visibility property must be a string enclosed in quotes
GroundOverlay.prototype.hide = function () {
    if (this.div_) {
        this.div_.style.visibility = "hidden";
    }
}

GroundOverlay.prototype.show = function () {
    if (this.div_) {
        this.div_.style.visibility = "visible";
    }
}

GroundOverlay.prototype.toggle = function () {
    if (this.div_) {
        if (this.div_.style.visibility == "hidden") {
            this.show();
        } else {
            this.hide();
        }
    }
}

GroundOverlay.prototype.toggleDOM = function () {
    if (this.getMap()) {
        this.setMap(null);
    } else {
        this.setMap(this.map_);
    }
}