Got stuck here: http://jsfiddle.net/UFkg8/
Right now the animation is top-down. What do I need to change to make it bottom-up?
If I change top to 100%; in .mask then it works but it also doubles the div's height and creates a scrollbar.
I've seen that you don't want to modify the .post, but why not add overflow:hidden; to it? This jsfiddle works for me (at least it does in Chrome).
