function OpenSeadragon( options ){
    return new OpenSeadragon.Viewer( options );
}
The names for the image resources used for the image navigation buttons.

@typedef {Object} NavImages
@memberof OpenSeadragon

@property {Object} zoomIn - Images for the zoom-in button.
@property {String} zoomIn.REST
@property {String} zoomIn.GROUP
@property {String} zoomIn.HOVER
@property {String} zoomIn.DOWN

@property {Object} zoomOut - Images for the zoom-out button.
@property {String} zoomOut.REST
@property {String} zoomOut.GROUP
@property {String} zoomOut.HOVER
@property {String} zoomOut.DOWN

@property {Object} home - Images for the home button.
@property {String} home.REST
@property {String} home.GROUP
@property {String} home.HOVER
@property {String} home.DOWN

@property {Object} fullpage - Images for the full-page button.
@property {String} fullpage.REST
@property {String} fullpage.GROUP
@property {String} fullpage.HOVER
@property {String} fullpage.DOWN

@property {Object} rotateleft - Images for the rotate left button.
@property {String} rotateleft.REST
@property {String} rotateleft.GROUP
@property {String} rotateleft.HOVER
@property {String} rotateleft.DOWN

@property {Object} rotateright - Images for the rotate right button.
@property {String} rotateright.REST
@property {String} rotateright.GROUP
@property {String} rotateright.HOVER
@property {String} rotateright.DOWN

@property {Object} flip - Images for the flip button.
@property {String} flip.REST
@property {String} flip.GROUP
@property {String} flip.HOVER
@property {String} flip.DOWN

@property {Object} previous - Images for the previous button.
@property {String} previous.REST
@property {String} previous.GROUP
@property {String} previous.HOVER
@property {String} previous.DOWN

@property {Object} next - Images for the next button.
@property {String} next.REST
@property {String} next.GROUP
@property {String} next.HOVER
@property {String} next.DOWN