dragscroll not working on hidden overflow photo reel

dragscroll not working on hidden overflow photo reel

I have a page at http://lindseymotors.com/v and when you click the main photo an expanded view appears with a row of photos at the bottom. I have attached it like this:

    $('.vehicleDetailExpandedPhotoReel').dragscroll();

But it doesn't work, nothing special happens. I have included the proper files as you can see in the header of the linked page. This is the GitHub page where I found the plugin.