Restrict Navigation Until Scrolling Panel Scrolling Bar Reaches the End

Hello My friends

Does anyone have any ideas for removing the ability to move to the next slide until the scroll bar on eh scrolling panel has reached the end? 

I have tried putting a transparent image on top of the scrolling panel with the trigger to change the next button to normal when the user hovers over the transparent box.  It works but, you don't get the "hand" over the section of the scroll bar, which makes it seem like something isn't working.