Removing horizontal fade from animSwipeDown

I don't do javascript, so this is probably really easy, but I'm just not getting it.

I am trying to get the swipe down effect without the "swipe out". I am planning on creating a menu that is about 500px wide, and the horizontal swipe effect is a little overkill on this size of a menu.

I've narrowed it down to:

' + ref.offsetWidth  + 'px,

If I remove that from animSwipeDown, it removes the horizontal swipe effect, but then the menu fades down from the top of the page.

What would be the best way to remove the horizontal swipe out while keeping the swipe down?

Thanks!!