My gallery is configured with button bar set to OVERLAY and infoButton="true"

I've tried various config options but can't seem to get exactly what my client wants.

Is it possible to achieve the following?...

- when the gallery page loads - caption is hidden and image navigation arrows are visible.

- visitor can then click on the info button in the button bar to show/hide toggle the caption only (which is set to "overlay_image") with the image navigation arrows staying visible at all times (currently they toggle on and off along with the caption).

... I've included the nav buttons in the button bar but it looks like a compromise. It would be better if the info button simply toggled the caption and left the image nav arrows visible. Can this be achieved somehow?

Thanks for any help,
Bill