Sortable Movement glitch

Sortable Movement glitch


First of all, here's my test page: http://brian.radioactivepickles.us/sort/index.html
So far, it's working great. Even with limited documentation, I've
been able to get it to do what I'm wanting. There are some JavaScript
things I want to do yet, but I wanted to get the actual sorting
working first.
The issue I'm having is that when I move one of the "pages" (green)
(it's supposed to be something to sort pages of a virtual book, so
they can be created out of order, but easily placed back in the
correct locations later) into one of the areas above it (so, move a
page from unsorted to a chapter, or chapter 4 to chapter 3, etc.. Up
the page) I get a graphical glitch. When it opens up the area for the
section that you're moving, where the Sortable is looking is where the
mouse is, but what you are dragging moves down when the space is
made. It's really a minor thing, but wierd.
Also, any reason that in IE7 you have to click on text to make it
move? In FF3, I can click anywhere and it moves. IE7 only moves when
you click on the text.