Kirupa thumbnails tutorial XML scroller question

I’m using the XML and FLA file from this tutorial:

I want to add right and left arrows to the thumbnail scroller so when the mouse is over the arrows, it’ll start scrolling.

The problem is right now, when the mouse goes over the end of the thumbnail strip, it activates the scroller. So when my mouse goes over the right and left arrows, it doesn’t do anything.

Regardless where I put the hit_right and hit_left movie clips, the scroller is only activated at the end of the thumbnail scroller mask.

Any help appreciated! Thanks!