Solves a problem when performing fullscreen view in IE - doesn't actually go full screen, and higher z-indexed items do not get obscured. Set the z-index to be really high when in fullscreen, but it needs to be lower so that when scrolling higher indexed items still appear on top without being on top when in fullscreen.
Merge pull request #51 from edx-solutions/mjames/IE_FullScreen

Solves a problem when performing fullscreen view in IE