[jQuery] Fade In Background Image - Fade Out Completely?

[jQuery] Fade In Background Image - Fade Out Completely?

Hi there I'm having some trouble. I want to create a background image
behind all of my site's contents, have it fade in when the page loads
and then maybe a little while after the next mouse movement have it
fade out.
So it'd be like
---->Fade in on load
---->Mouse movement
---->3 Seconds after mouse movement fade out
So yeah if you guys could help me with that it'd be GREATLY
appreciated
~Peace