Comment 2 for bug 771226

An implementation note for anyone that works on this: the overlay position is set in create_overlay using the YUI alignment mechanism: .set('align', ...). The reason we did it that way was because the initial size of the overlay is considerably smaller than the total height when the optional form elements are displayed. When at maximum size the overlay would grow below the fold forcing the user to scroll down.

Any change to affect the horizontal alignment should maintain the vertical position.