I took this ZoomPrevNext Widget versionZoomPrevNext-1.1.1-2015-5-13 (download - widget by Larry Stout)
to create the same widget but with images as arrows and slightly changed styles.
The Widget.html and style.css were changed accordingly.
Note: In my app I have changed the opacity for all the on-screen-widgets so you might need to set it back to the 0.2 resp. 0.4 for the hover styles to match with the other buttons in your app.
Please refer to the original posting how to include the widget into your app.