Unveil.js not working properly on a inner div

I have a scrollable div that isn't cooperating with Unveil.js. It loads a certain number of images, but when I begin to scroll the div, all I see are a bunch of images that are waiting to be loaded. Only after I hit the very BOTTOM of the entire div do the rest of the images all load at once. I'm poking around the code and it looks like Unveil.js looks at the window objects, and the code is meant to work for images that are within the window object's scroll. Anyone have any hints on how to fix this?