How to disable Next/Prev Buttons in Lightbox

We have a lightbox that sits on top of a base screen within the course.  The lightbox has an "x" button to close it.  When the lightbox is closed, the learner will see the base screen again where he/she can select another hot spot and open another lightbox.  When a lightbox is open, we don't want to the learner to click the Next or Prev buttons which would take the learner away from the base screen. We only want them to be able to use the "x" button and go back to the base screen.  Is there an easy way to disable the Next and Prev buttons?  Thanks!

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