Based on code from reinderbrouwer which can be found here: http://pastebin.com/VhADqn5p

I made it even smaller and changed it back to the original color.

If you wish to disable stickiness, you can do it in your preferences here: http://stackoverflow.com/users/preferences/

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1.0.2 - Fixed the header being 3px taller than it should have been.
1.0.1 - Fixed the problem with full logo when you're not logged in (now it always uses only small glyph), and made login button bit more pronounced.